Well, I gotta disagree with the sentiment that there are no modern bands that can duplicate their recorded sound and precision live. Fear Factory does it, Strapping Young Lad does it, Death did before Chuck died, Soildwork does it, Type O Negative does it, Mesuggah does it, there are MANY who do it. But I admit, radio rock bands are not capable of a good sound live or of tight precise playing. If you don't look beyond radio, you wouldn't see any bands that are capable of sounding good and playing well, live.
The secret is not being lazy. You MUST practice for hours on end untill you get it. I'll spend DAYS on ONE SINGLE guitar rythm untill I am satisfied that I have done it right. Too many people are satisfied with "close enough" and rely on studio magic to clean it up. That sucks ass and I have zero respect for those people.
There is no easy answer or quick fix. You either do it right or you don't. You either practice or you don't. In the end, your choices will be evident.