You could make the argument Landeskog is as good as RNH and given RNH's size, he could end up having as many injury problems as Hall.
Being small has nothing to do with injuries. It's unlikely Nuge has injury problems, as he rarely gets hit. RNH is a higher tier of player than Landeskog is, and that should be evident soon.
I'm not saying anything about who is going to be the best from their draft class, cause it's pretty impossible to say at this point. But I think us Oiler fans all know what we are gonna be getting from Taylor Hall and Ryan Nugent-Hopkins. Nuge will be a 70+ point guy, and that's with the lowest expectations. If he continues to develop and use his elite vision, 90+ isn't out of the question. Hall will be a 30+ goal 70-80 point player. Hard to say if he will be the best from his draft year, but I wouldn't call that underachieving.
Too early to say anything about Yakupov, but it's hard to imagine him not lighting the league up with a shot like his.
I'm just trusting what I see with my eyes. I see speed, desire, and a decent shot...and not much else. Perhaps someone can point me to a game or play where he showed elite hands, vision, playmaking, play-creating, creativity, etc.
Why? What do you see that I don't? Break it down for me. I like watching the Oilers, Eberle in particular. But, for example, other than speed, I don't see what sets Hall apart from a guy like Evander Kane.
If you'd watch the Oilers play often enough, you'd notice just to what extent Taylor Hall can dominate some hockey games. Without him in the lineup, the Oilers offence is almost non-existent.
As someone who watched around 80 Oilers games and 40 Jets games last year, I can tell you that Hall has wayyyyy more hockey sense than Kane. Kane relies more on his slightly better shot to score goals often from long range, whereas Hall relies on his great positioning to score goals in the slot or at the side of the net. Hall dishes the puck a lot better than Kane (probably Evander's biggest weakness) and if ever he develops softer hands, he can become a 50 goal scorer for sure in this league (considering he whiffs on 80% of his many many breakaways).
I don't know that any will underachieve, I think they're all going to be very good players. I don't see any of them being a Daigle, Stefan, Philips, DiPietro, etc. type where you think "damn, THAT GUY is a former 1st overall pick?" It's pretty common for 1st overall picks to NOT end up the best player in their draft, there are tonnes of 1st overall picks who panned out well despite later picks playing better than they did. For example, here are the top 20 NHLers in terms of career points among guys who were still in the NHL last season, and the position in which they were drafted:
1. Jaromir Jagr - 5th overall
2. Teemu Selanne - 10th overall
3. Nicklas Lidstrom - 53rd overall
4. Daniel Alfredsson - 133rd overall
5. Joe Thornton - 1st overall
6. Jarome Iginla - 11th overall
7. Ray Whitney - 23rd overall
8. Jason Arnott - 7th overall
9. Marian Hossa - 12th overall
10. Patrik Elias - 51st overall
11. Martin St. Louis - undrafted
12. Vincent Lecavalier - 1st overall
13. Patrick Marleau - 2nd overall
14. Ryan Smyth - 6th overall
15. Milan Hejduk - 87th overall
16. Shane Doan - 7th overall
17. Ilya Kovalchuk - 1st overall
18. Brad Richards - 64th overall
19. Saku Koivu - 21st overall
20. Brian Rolston - 11th overall
Only 3 of those 20 were 1st overall picks, and only 5 of those 20 were top 5 picks. The majority of the time a 1st overall pick turns out to be quite a good player, but at the same time most of them do not end up as the top player from their draft class when it's all said and done.
Further proof that being picked 1st overall but NOT ending up the best player in your draft is very common, and not a disappointment/under-achieving:
Here's all the 1st overall picks from 1990 - 2006, and whether or not they ended up as the best player in their draft. I didn't include the most recent drafts, because for many it's too early to judge.
2006 - Erik Johnson - no (Jonathan Toews, Claude Giroux, Nicklas Backstrom, etc.)
2005 - Sidney Crosby - yes
2004 - Alex Ovechkin - arguable (Evgeni Malkin)
2003 - Marc-Andre Fleury - no (Eric Staal, Shea Weber, Ryan Suter, Ryan Getzlaf, Corey perry, Zach Parise, etc.)
2002 - Rick Nash - arguable (Duncan Keith, Cam Ward)
2001 - Ilya Kovalchuk - arguable (Jason Spezza)
2000 - Rick DiPietro - no (Lundqvist, Heatley, Gaborik, etc.)
1999 - Patrick Stefan - no (Henrik Zetterberg, Daniel Sedin, Henrik Sedin, Ryan Miller, Martin Havlat, etc.)
1998 - Vinny Lecavalier - no (Pavel Datsyuk)
1997 - Joe Thornton - yes (though not far ahead of guys like Marian Hossa and Roberto Luongo)
1996 - Chris Philips - no (Zdeno Chara, Daniel Briere, Tomas Kaberle, etc.)
1995 - Bryan Berard - no (Jarome Iginla, Shane Doan, Miikka Kiprusoff, etc.)
1994 - Ed Jovanovski - no (Daniel Alfredsson, Patrik Elias, etc.)
1993 - Alexandre Daigle - no (Chris Pronger, Paul Kariya, Todd Bertuzzi, Kimmo Timonen, etc.)
1992 - Roman Hamrlik - no (Sergei Gonchar)
1991 - Eric Lindros - arguable (Peter Forsberg, Scott Niedermayer)
1990 - Owen Nolan - no (Jaromir Jagr, Martin Brodeur, etc.)
Of these 17 consecutive drafts, the 1st overall pick was only the clear best player in his draft on two occasions (Crosby in 2005 and Thornton in 1997). In another 4 cases the 1st overall pick was arguably the best player in his draft (and that's being generous, for example Lindros being arguably as good as Forsberg), and in the other 11 cases the 1st overall pick was clearly not the best player in his draft. So the vast majority of the time, the 1st overall pick does not end up the best player in their draft. That doesn't make them a disappointment, though, you'd be crazy to call guys like Owen Nolan and Vincent Lecavalier disappointments just because other players from their draft years ended up better.
The 1st overall pick isn't a guarantee of the best player, and it never has been. It's just as close to a guarantee as you can get that you're getting a great prospect who should become a great player.
All will be good players. Your poll doesn't really make any sense. Underachieve? The only one I can see really underachieving is Hall as others have said because of injuries. Seguin is arguably better than Hall right now as well and I think they'll be neck and neck for a long time.