I agree with earlier points you made in your post (not quoted here) about the story being pretty much the same old gears. for the most part, at least for how little into the game I am, it is.Just to be clear I'm not saying it is a bad game I just don't know how anyone who hasn't been a giant Gears fan (i.e. pumped a lot of hours into 1 & 2) can notice a lot of difference to call this the best Gears game.
I wanted to quote the above because I didn't pump a lot of time into Gears 1 or 2 online because it didn't hold me. I found it to be a bit too difficult to have any success and a little bland. Gears 3 has a "casual" online mode that's just TDM for lower level players and it's a pretty even playing field. I got down the mechanics and gameplay and really started liking it a lot.
The whole thing is just wrapped up into a superb package and the "blandness" has been addressed by giving you individual goals to work toward. Earning ribbons, medals, etc adds a lot for me personally. Seeing a recap of how much XP you earned after each round, how it was earned, what ribbons you achieved, etc.. just adds a lot IMO.
Played some co-op horde mode last night and had a blast. The tower defense stuff is pretty basic, but still just a lot of fun to get with 3 others and work through it.
The graphics are top notch and the presentation of the package as a whole is top shelf stuff. Wasn't a big fan of 1 or 2, but I'm sitting here at my desk itching to get some more online gaming in with it.
Also as stated above, having dedicated servers has done A LOT to address lag issues and even out the playing field. I haven't once noticed even the slightest bit of lag while playing online.
Admittedly, I'm a competitive online guy and not that much into single player campaigns and the like. I just don't have the attention span for it I guess.