Adding some more.
Steins;Gate
A cool concept let down by poor execution. It's hard to tell what's going on. Being a mystery series is fine, but I would like to see more of the story outside of the main character's viewpoint so that I can at least gather my thoughts and come up with ideas. I get the impression it's trying too hard, and if it's not careful, it could end up like Chaos;HEAd.
X-Men
A decent start. This is what I expect from a Japanese adaptation of western comic book superheroes. I was a bit apprehensive about this after the atrocity that was Iron Man and I didn't even try Wolverine. My worries were put to rest so it'll make for a decent time filler. I just wish these shows would stop making excuses to take these western superheroes all the way to Japan. There are other countries in the world.
Tiger & Bunny
This show has the best concept of the season. It seems like a fun show and everything seems solid. The CG suit models leave a lot to be desired, but the designs are cool (I like Tiger's suit). I also like the art style. Outlining characters in red instead of black is pretty refreshing. I don't think this is Cowboy Bebop calibre, but it has potential.
Hanasaku Iroha
I think this has been the biggest surprise so far. There seems to be a wide range of characters, and the girl is quite bubbly and outgoing. She is very likeable. This series looks like it will be a welcome change of pace since everything else this season is a lot less low key and rather wacky. It looks like there is some good drama to be had. I notice some people seem to hate the grandmother, but I don't think she's a bad person. She's very strict but there was a very subtle glimmer of respect from her when she slapped the girl. I sense Hanasaku Iroha being the dark horse of the season.
Kaiji: Hakairoku Hen
ざわ…ざわ…
Only Kaiji can make drinking beer and eating food so tense. It's not good for my heart. It's remarkable how well Mad House are able to manipulate the viewers' emotions. There's not just tension. There's also a lot of rage to be felt. Not just at the people tricking Kaiji into bigger debts, but at Kaiji himself for falling for it every time. However, I can't help but root for him since he has had some close calls and lost many friends along the way. I guess you can say he's a lovable loser.
So far I think Hanasaku Iroha and Kaiji: Hakairoku Hen have the biggest potential this season.