Funny how Revenge of the Sith is in S tier in almost all of these tier lists these days. It's my favourite Star Wars movie so I'm not complaining, but you wouldn't have seen that 10-15 years ago.
The Phantom Menace being in A is also something you wouldn't have seen then. Personally I'm not a huge fan of it, but it's better than many people made it out to be back in the day. I still prefer Attack of the Clones though.