Now that the series has come to a close, I'll take this time to say HOLY F***ING SH*T!!!!
Maybe I'll be a bit more verbal once I come down from the adrenaline high caused by way too much hype
But I'll say, objectively, this is one of the best anime's I've watched in a long time. This finds a spot in my mind with Ghost in the Shell, Gurren Lagann, and Fate Zero and Stay/Night (the newer series). Madhouse is a fantastic animation studio, and they absolutely kill it here, especially in the fights. The story is silly and cliched, but it knows that. It has fun with, and makes fun of, the tropes we've seen in animes time and again. What I think I like the most is: it has a solution to the "Mary Sue" problem.
I don't think it's too spoilery to say that the main character is someone who defeats all of his opponents in a single punch. It's the name of the anime for pete's sake. The dude is overpowered. How they handle him, though, I think is perfect to have someone with that character type still remain interesting. I almost wish the writer moved over here and worked for DC. Give the Superman writers some ideas.
So if you're looking for a short anime, and haven't seen One Punch Man yet: Watch it! Like now! It's twelve episodes long, and currently has one OVA I know of, with five more on their way.
Anyway, Just wanted to get that out of the way. Going back to work now...