While I've played every one of the Phoenix Wright games, they were starting to get old by the third game that had introduced little or nothing to the formula.
Then we get Apollo Justice, an antagonist that isn't as likable as Mr. Wright and even more outrageous situations like the rock star prosecutor. Toss in the fact that rehashed mechanics of "forensics" were still there and you get the final straw for me.
While the perception mechanic was new and different, it wasn't enough to save this series from itself. Was a fun series at first, but it never evolved and eventually grew stagnant. Stopped this one by the time I reached the third case.