What I liked :

Ewan McGregor

Liam Neeson (for the most part)

Ian McDiarmid (until his transformation scene in ROTS, anyway ...)

John William's score

The idea that the Jedi order isn't an order of perfect, pristine monks but an order of corrupt, dogmatic fools.

Darth Maul

Darth Maul's lightsaber

The duel in TPM (though it does get a bit too flashy after Qui-Gon leaves the fray)

Mace Windu's lightsaber (his purple blade almost makes up for the monotony of the other lightsabers)

That's about it, unfortunately.