camber may be negative on the rear as well. toe in is almost never 0 in front, regardless.
alignment may fix your toe in, camber not adjustable on typical alignment rack. also, looks are deceiveing. empty car, full car, etc etc. i seriously doubt you can pick up 2 degs of difference by looking, but certainly the car will drive like crap.
alignement check always worthwile, but have them give you print outs before and after. it may be pulling for a different reason (tire pressure , caliper stuck