Elmofongo: 2 had the BEST campaign. AWESOME setpieces that makes COD and Uncharted look like it has TV show budget than a Movie budget.
Gears 3 has the best Horde mode (essnetially hold your ground against Waves of enemies.) Which has base building such as wall fortifications and turrets and a final boss fight.
I never really got into the multiplayer mode in any of the games but I
adored both Gears 2 & 3's campaigns, easily some of my favourite action games of the generation.
stg83: I know, but it was really buggy on PC and we never got the sequel but I take the release of this ultimate edition as a good sign that they will bring the sequel to PC as well at some point.
Y'know, I never really hit much of the buggy-ness with my copy of Gears, the only thing I had issue was with it initially overwriting and breaking GFWL install with it's older version, a quick reinstall of 3.5 and the game ran without a hitch on all three systems I've had.