Severus Snape and Slytherins in general seem a little to saintly in this but otherwise it's a wonderful read. Set just short of the end of Harry's first year, Professor Snape finds that every book he owns has become "Harry Potter and the Philosopher's Stone." Being the Deadpan Snarker that he is, Snape proceeds to mostly mock and chide throughout each chapter pointing out a lot of the things that likely rubbed most readers the wrong way. Through it all, Snape never breaks character and you, dare I say it, humanity peak out from behind all the sarcasm and contempt.
Ultimately it's a fix fic but it's one you can hardly hate. The characters are too well done and, in a first for me, there isn't any bashing. The situations don't have easy fixes and everyone is just doing their best to sort things out.