Any games that require strategy and difficult shots can be fun. IMHO, if you don't find other machines fun, you're simply not getting it. I was in the rut for a while with only playing 90s w/b until tournament play forced me to learn older games. They are just different. Equally fun, but refreshingly different, even ems are fun. New Stern's are great to learn trap and shoot. Again, different and fun.
My Genie has been non stop fun since purchase.