I don't know how to explain that one. Gears 2 was atrocious and no one liked it. Epic tried to change the gameplay to what they wanted Gears to be and didn't like the fast-paced, close quarters oriented style the multiplayer was in the first game.
The game was a mess and games would last ridiculously long. It would end up being long range stalemates because the Hammerburst was ridiculously OP and would 3 shot anyone. The game had a terrible netcode so host had an even bigger advantage than in 1.
I don't see how anyone can like Gears 2. While it does some things better than 3, it's not even close. 2 also had the worst maps of the trio.
Gears 2 was ok, but a bit of a bummer in terms of story and pacing. Gears 3 is generally a better game though - and looks fantastic (minus lacking AA).