I totally agree with Azrael here.

Some people get tied up with trying to play crazy stuff on the bass. There's nothing wrong with that, and you should do all that, if you can. But before you can go nuts playing crazy fast stuff, you need to learn how to lay down a basic groove.

I've always held the opinion that if you have a solid rhythm section (bass & drums) that plays really tight, the rest of the band will just fall into place. Think of bands like SRV & Double Trouble, Rush, The Police, etc. Like Azrael said, if the bass and the drums are not in the same groove, then the guitarist can be doing anything, shredding or the most soulful blues, but it won't come through.