This is probably fun if you're a big fan of the (late) 60s, preferably the Jewish/NY scene. Fritz the Cat was my first Bakshi, so I didn't really know what to expect. What I know I didn't expect was a pretty explicit and adult-oriented film, but for once that wasn't a very pleasant surprise.
There's a lot of political/activist/anti-establishment dialogue to wade through, already touching upon subjects like white guilt. I guess you could say the film still has relevance. But these instances seems rather incidental, as Bakshi races through most of the political issues of that time and does so with little care for subtlety.
The animation is functional, the art style ugly, the music horrendous (but again, if you're a fan of the 60s, you'll probably love it), the voice acting grating and the comedy not that funny. And for a film that tries to be controversial, it has lost a lot, if not all of its impact. Fritz the Cat is a relic from a time period I don't really care for.