Got the game yesterday, rushed through the campaign. It's incredibly polished, and yeah, there's so much happening on the screen. I do think they went a little light on some of the core combat, and opted for too many gimmicks, which weren't really as ironed out as the stop and pop gameplay.
I'd have liked to see more of the old enemies, particularly more Theron guards and more boomers. I don't think grinders/maulers were as fun as the boomers. And in contrast, the mortar locust felt a bit cheap.
Also, if there's a Gears of War 3, what're we gonna see? Ninjas vs. dinosaurs?
I agree with a lot of your thoughts, which I've already posted about. I think it's a great, Epic, sprawling game, yet I still oddly think the first was superior.
I also agree with the Ninjas versus Dinasours qoute, I think Epic got too caught up in the idea of just trying to come up with the most over the top scenarios they could (picture staff meeting: "how about, fighting ten brumaks, while flying backward, while on fire!") instead of making a solid game that flows naturally so the highs mean something. I noticed this in some interviews they gave and I was worried about it before the game even shipped.
Hell, honestly I still feel like we were denied a proper, one on one, on foot, Brumak fight. You may see, fly, ride by, ride on, dozens of brumaks in this game, but not once to you get up close and personal for a fight. In fact the many times you face Brumaks you are seeing usually LOD models and such from a distance, making me wonder to this day if the system simply cant handle a proper PC-style Brumak battle that I crave so much.
And you didn't even bring up the very lackluster end boss/ending. The only positive thing about the ending is it felt so rushed, It honestly gave me some hope that the initially ridiculous-seeming Gears 3 in 2009 rumors are actually true. Though I really doubt it, man that would be a happy surprise.