Eh, I just remembered how open Reach's missions were so I guess you're right. I ought to give that game another play for sure.
I don't think the criticism is unfounded, but it's difficult to say much of anything based on 3 missions of edited footage. If the game ends up feeling like a tube after i've had my hands on it, i'll be making just as much noise. What I've seen so far however does not have me convinced it is shaping up to be that way.
I think at this point, if they still haven't figured out what made the good Halo games good and the bad ones bad, then its pretty much hopeless.
Halo CE had great levels that you could play a bunch of different ways.
Halo 2 had an excellent MP with pretty boring SP levels
Halo 3 had excellent SP levels to explore, excellent MP
Halo ODSTs open world and music was amazing
Halo Reach had lodouts which people didnt like and unbalanced MP
Halo 4 felt too much like a COD game and not a Halo one
If i can do this in 2 minutes, these guys have certainly done this too and a lot more in dept.
Edit:
From what ive seen in halo5, they seem to be hitting all the right notes in the right spots. Arena looks like its what people want 4 on 4 Halo to be. Everyone starting on the same foot with map control. SP looks to have levels that will let you approach battles in a bunch of different ways and you have Warzone for the people who want big crazy battles. I dont see how anyone cant be hyped for this honestly.