well first of all i should say hi to all cause this is my first post....
now on topic ,dubie is right full on.
when you record live there are 3 really important things: instruments and settings (meaning cymbals ,drum tuning , gtr amp/settings...) , mic positioning (avoiding phase cancellations is really important too if you want some decent bass freq.and especially if youre gonna mix in mono) and room acoustics.in general the point of a live recording is to capture a band playing in a room so i guess we all like it kinda muddy but not too much.you need some definition too...
so ,i have to add 3 things to dubies spot on reply.first check out some stereo mic positioning techniques and experiment.there are alot of stuff you can do with 4 (or even 3 mics).second get your drummer to mind his dynamics.third import your rec tracks in some sequencer and experiment with the eqs a little.this way you can propably get some definition out of most recordings. but be carefull its easy to get excited and overdo it...:)
cheers