I am happy to report I haven't even equiped the lancer since November, since I hate the chainsaw so much. Yes, I still die by the chainsaw all the time, and it is the worst part of the game, but the melee shotgun pisses me off nearly as much. I'd say 80% of my deaths are due to chainsaws or melee/shotgun.
In fact, I'm ready to declare that Gears 2 shines most as a fun game in long distance fighting. But the close combat really drags it down, as it usually feels like a coin toss most of the time; and it seems most players tactic is to get as close to you as possible as fast as possible, which keeps the game in mediocre land.