I'd like to see Raiders give a bit more xp, so its proportional to their HP pool. As it stands Raiders serve only as an inconvenience. Killing them isn't even worth the 10mm I'd use to do it because the xp is so meager, and the loot is such shit.
Perhaps this is the point however, that raiders be a persistent nuisance to the players.
I just think it would be a bit more fun to gain early levels killing some raiders every now and again, as opposed to dropping molotovs on manti.