Well, Mandalorians and Ithorians (sp?) won't mind which side you're on, as long as you're good at what you do.
As for the other NPC's in your merry little gang, having known the person even before it turned out (s)he was Revan helped alot. ('cept for Jolee and Bastila, but they're special cases)
They knew what "light side" Revan was like (if you played as a LS Revan, of course), and therefore had a hard time hating him/her. Now, if they'd met Revan *after* the revelation, the chances of them making up with him/her would probably be close to none, hovewer.
Besides, very few of the "common folk" know that you're actually Revan, and the fact that (s)he's still alive isn't exactly known throughout the galaxy, if you catch my drift. So the chance of "angry mobs" is also very remote.