It's hard to gauge how good the game is based off the beta much like how you can't tell how good a show is based on 1 or 2 episodes. Nothing I saw made me say "Christ, this game looks awful!" but conversely nothing made me say "Christ, this game looks awesome!" At times it feels like a Halo map pack. I mean the shotgun is almost copy/pasted from the Halo series, and the steady 30 FPS movement makes it feel, if nothing else, very familiar to those games. There was little to no story in the beta, and the missions are broken apart a'la Borderlands where you have a hub and then go out on missions. I wasn't able to delve into the competitive multiplayer much because the beta pulled that BS move where you have to get so many experience points before you can play the other modes. I was stuck playing "Control point" and got annoyed by the fact that everyone had better weapons than me and my team did about as well as the Broncos did in the last Super Bowl.
Based off what I've played I don't see this game setting the world on fire like Halo did back in the day, but that's just my opinion. It's in my Gamefly queue so I'm still interested in it (although part of it being there is the fact there's not much better out around that time, and Hyrule Warriors is coming out 9/26.)