If the drums are recorded poorly, it's really hard to fix them after the fact. It's pretty important to get the drum sound as close to what you want when recording as possible. Once the tracks are laid down, there are some things that can be done with mixing, IQ, mastering, etc. but there is really no getting away from a poor recording.
With Ultimatum's Mechanics CD. I HATED the snare sound when we were recording it. I commented to the engineer that it sounded to high and poppy like the snare wasn't tuned correctly. He kept assuring me, "we'll fix it in the mix". Of course, that never happened. He tried EQing it to please me, but I always hated that snare sound.
If you've recorded the snare with a trigger, you can easily change the sound because it's all computerized sounds, as opposed to a natural recording. Many bands go this direction these days. You can also easily fix mistakes that way.
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ULTIMATUM - TOO METAL FOR WIKIPEDIA!