I don't know about Ben-to being "so bad it's good", I don't think it was bad at all, I think it was a genuinely good comedy. The seriousness of fighting over the bento boxes was all part of the joke, and using the same VA for Sato that did Yoshii in Baka Test was perfect.
I think the "so bad it's good" title is reserved for things that you find funny for unintended reasons. Like, Prince of Tennis, where it's meant to be serious, and that's -why- you laugh at it.
Ultimately I think the difference is laughing "with" the anime or laughing "at" the anime. :P
Chihayafuru mainly uses the card game element as a means for character development. It's currently in flashback mode atm (anime is 2cours so it has time for that), and the theme seems to be childhood bullying atm, which is why I very much like it. I'm surprised you disliked the main lead though (outfront type) thought u liked that type .
Guilty Crown was pretty good yeh. Main problem for me though as stated in my post in the thread was that the MC was a bit boring and whiny.
I still thought P4 ep2 was crap. Will be keeping it on hold for now, but do tell if it gets better.
And yeh, Ben-to was good in a so bad it's good way .
To be honest, I'm actually not that keen for FSN marathon, considering how good Fate/Zero is . It's a significant downgrade - like going from Windows 7 to Windows Vista . But hangout/drinks might be good. Plus we got that "issue" to sort out too beforehand... (Matt still hasn't got back to me, so I'm going to give him a buzz tonight)