could be, or just be badly balanced.

did they use a cone or stud balancer?

I had the same problem with mine, had the wheels balanced which cut the vibration down but did'nt cure it, i thought that there was a problem elsewhere so i just put up with it.
2 years later had both front tyres replaced which obviously included balancing, after that the vibration was gone. Needless to say they had'nt been done correctly in the first place.