Excluding Episode 5 (the best) and Episode 4 ( for member berries) All other Star Wars movies are flawed in one way or another, but at the same time have shining moments. For me it is looking at the highs and lows moments and seeing how they stack up.
So for example (and not going through every high and low) Phantom Menace (which I rated last) has high points in the final Duel of Fate battle, Liam Neeson, and Palpatines plan. But that does not override Jar Jar, Anakin starting to young (and saying yippee to many times) and the whole Padme/Queen Decoy sideplot.
Return of the Jedi gets some props for the final space battle, the Emperor, and Luke being kinda a badass in the beginning going into Jabbas place. But it lose points for anything regarding Ewoks (which is much more Lucas selling out to toys then Jango Fett ever was), Boba Fett getting bested by a blind Han, Yoda sounding like Super Grover, and the whole "Shes your sister" twist.
So for Attack of the Clones we get lows like the whole Anakin/Padme romance and some horrible dialogue associated with it, and also the R2D2 video game level towards the end, but gains for a pretty good opening chase scene, Christopher Lee, expanded parts for Mace Windu and Yoda, And the Clone subplot in general with hidden planets is pretty good. Parts with Anakin and Padme are bad, parts with Obi Wan (with or without Anakin) are pretty good. Watching the only time we will probably ever see lots of Jedi kick *** along with Stormtroopers that actually can shoot is pretty excellent.
Again thats not every high/low for each of the movies but in the end AOTC highs/lows average out better the PM or ROTJ highs/lows for me.