I think Star Wars Epsiode 3 is actually the least enjoyable watch of the whole series. There are little to no stakes, because we know which characters will live and which will die because of the later movies. Additionally, I actually like Ep. 1 Anakin more than moody teen Anakin. Sure, the child actor is terrible and badly written, but there's some good hate-watching there. Ep. 3 is just... tedious and unimpressive.
(Note: I am an incredibly casual viewer, and am not huge on Star Wars in general, so this opinion has very little weight).