Jared Leto was a good Joker.
If only he had more scene and a bigger then you can judge him but I also like him as Joker because he had a different style.

This man simply does not have the range or versatility to play any roles outside of The Social Network. Both are horrendous casting choices, though.

I personally think Jared was great as The Joker and he put a lot of dedication into it. He would've benefited from a bigger role as The Joker and he's not the best Joker but he was great. Jesse..... NO! He was so over-the-top and silly and wasn't Lex Luther AT ALL! He felt more like a Dora the Explorer villain than the stiff and serious Lex Luther. Now that was terrible casting!

I actually thought Jared did a good job.

I mean, I don't blame Jared for his performance (at least, not all the blame). Most of the blame goes to the horrible script and the horrible directing. And at least he's actually given good performances in Requiem for a Dream, Dallas Buyers Club, and Fight Club.
Eisenberg is just someone lacks acting ability and skill who has never given a good performance outside of The Social Network.

I thought Jesse did a great job with a new interpretation of Lex. I personally was intrigued by his character and though I didn't find him outwardly threataning, his demeanor freaked me out to a point that I thought he was prettty damned good. I can see why he isn't for everyone though.
Jared's performance was an obnoxious attempt at making the Joker "edgy", but all he did was turn a fun and threatening villain into a hot topic employee. in my opinion he went way over the top in terms of method acting only to give a mediocre performance.