Practice sticking and get familiar with 1/32 notes... Missing snare, crash and bass hits is bad news, but you can get by if you miss a few yellows and blues... knowing this, during faster sections play a slower tempo version of the beat but be sure to hit the snare and crash in time. The game can be fairly forgiving, and for those who really have to work at playing fast giving your right arm a break once every few measures can help you get past some tougher songs.
Skipping overdrive fills is also a cheap way of avoiding tough fills, but can mess with your timing.
The sock-mod (look it up on YouTube, basically elastic-bands and socks wrapped around your drum pads) will help you get your rolls tighter, since the Rock Band drums are so-so, and will likely improve your scores a touch. Viewing other player's sticking patterns in YouTube videos for trouble songs will also help more than you might realize.
Above all, knowing the song by heart will help you a lot. You don't need to know the drum part, but being familiar with it will make things a lot smoother.
And when all else fails: practice, practice, practice!