I remember my Amiga buddies having the same issues (I myself went from a C64 to a 286 earlier than they). Main complaints were the OS (i.e. Windows, whether it's 3.11 or 95), and a general lack of smoothness (again, OS and multi-tasking, smooth scrolling not being something you get for free with a VGA).
Also, the PC, assuming VGA and at least SoundBlaster, had fewer limitations there, compared to e.g. the Amiga's half-bright modes. It was way easier to get something more garish.
(I felt a bit like that regarding the C64's SID sounds to the more generic-feeling samples of the Amiga. Especially when the latter veered towards Eurodance)