I think you should! I used to be in a ton of landcomms (which I have since quit), but this one, I think, had the most fun challenges of all of them. And it's multi-fandom, which is nice, so you can use pretty much anything as long as it was ever on TV.

Plus it's only three months and there were usually a good mix of easy challenges in case you're really busy and can't do the harder ones.

So I say go for it! What do you have to lose? :)