DI everything you can and like Modo said check your levels.
Just because you are the loudest live band in history doesn't mean you record the same way...unless you're Lemmy of course.
The default output levels on a lot of guitar multi FX need tweaking for recording (if you DI them) or they sound like a goose farting in the fog.
Mic'd up drums can be a black art in a small scale recording studio, if you want to sound like John Bonham use virtual/software/sample drum sounds.
Also nothing shows up sloppy playing, singing technique more than recording (I usually find beer & sloppy technique go hand in hand

). Live playing style doesn't really cut it in a studio, you need to be precise and damp those strings that usually don't get noticed when you're blasting away live.
Apologies if i'm telling you stuff you already know.