I think I would agree that I preferred 1991 to 1990. I think the think the lack of well-recognised 5-star classics disguises the breadth and depth of great angles and matches. WWF and USWA, and towards the end of the year WCW provided great stories whilst NJ, AJ and to an certain extent Joshi and WCW had strong years in-ring.
You should enjoy 1992. Not halfway through yet and I think it has already exceeded 1990 and 1991 in numbers of great matches!