I thought the weak part of the Gears games was art design. Almost everything looked stupid. The presentation was fantastic though. The roadie run, the zoom ins for the chainsaw kills etc. Gameplay wise, it was top notch. The character designs always bothered me. The golden palace at the end of Gears 3 looked great. Other than that, I didn't like the world they created, the characters or the dumb things like razor hail (wtf?). The game was just so fun to play. There was tons of room for improvement.
And with that said, Gears 4 does not look like an improvement. It looks like ... dicks. That teaser trailer was amazing, but the multiplayer is visually underwhelming. Everything just looks so ... boring. Repetitive textures, with everything at perfect right angles. Flat looking world. Uninspiring. Here's hoping for the single player, or a pretty significant change to the multiplayer maps in the retail version.