I have played a few games on STTNG and also been truly unimpressed. I dunno if it's something wrong with me, or something wrong with the ones i've played, or whether the machine right sucks - but I certainly wasn't impressed with it.
At Pinball Wizard, I played a handful of games on STTNG and walked away bored... I normally like Richie games, too - I enjoy Spiderman, loved F14, and own a No Fear... But STTNG just didn't seem to do it for me.