Then you haven't played Family Guy yet! It's so much fun!
I must admit that I was once myself kind of a "Stern hater". I just didn't like the feeling of the games (compared to my BLY/WMS only collection back then). The artwork was shitty (it still kinda is with all the photoshop love going round), the feeling was just 'wrong' and the sound and music quality was horrible! I must confess I hated Lord of the Rings when it came out.
Gradually I have come to love the Stern games for what they are: great fun! I think this starts when you stop comparing them to Bally/Williams games. Everybody say after me: STERN IS NOT BALLY/WILLIAMS! They flipper differently, not worse.
No really, I think Stern deserve more credit than many "pinball fans" give them. This former Stern hater now has a Spider-Man, a Simpsons Pinball Party, a Lord of the Rings and a Family Guy. I like them just as much as my Bally/Williams games (AFM, TZ, STTNG, DW etc....)