The specific books were Myth Directions, Hit Or Myth, M.Y.T.H Inc. Link, and Myth-nomers And Im-pervections. I'm not going to treat them seperately, as they're all pretty much alike. Silly comic fantasy, with lots of puns and parody of genre cliches.
Asprin is good, but uneven. Occasionally hilarious, mostly quite fun and sometimes misses the mark. As the series goes on, there's some development of the (initially cardboard) characters. However, there seems no danger that serious issues will be addressed.
various Myth Adventures books (Amazon)