Framer, generally speaking the tug, towbar and nose gear should all pretty much be in a straight line down the center line when pushback is complete.
Exceptions to this would be when late adjustments are made to try and put the a/c fuselage straight on the line though, having said that, any good experienced tug operator who is familiar with the various aircraft types, bays and stop points should be quite neat and smooth every time.
Learners and inexperienced, well that's another matter.