Phoenix Wright: Ace Attourney is a brilliant game, but it's a lot of reading and like...no replay value, but it's amazing while it last.
The second one, Justice for All, is pretty good, though is not nearly as good as the first.
The third one, I haven't played, but it's supposed to be the same as the second, good, but not nearly as good as the first.
The fourth is called Apollo Justice or something stupid but it's supposed to be really good.