Monster Girls is a giant cocktease, in almost all senses but literal.
Oh, there's plenty of tits and panty shots. I honestly can't tell if it's supposed to be ecchi or hentai, and frankly I don't really care to figure out. The art definitely compliments this, tits, panties, and asses are all drawn expertly and in glorious detail. You'd expert nothing less from a kinda-pornographic kinda-not manga, and as time goes on they get a cast of monsters so big one of them is sure to fill under one of your sick fetishes. Unless you're into dudes and only dudes. In which case run, run as far as you can from this thing.
My biggest problem with Monster Girl is that it could be so much more. It's obvious that the author put a lot of thought into this world, and if you can get past the porn it's actually pretty interesting. There are laws about "extraspecies" that actually make sense, and the monster girls' monster-ness are by no means aesthetic. The harpy doesn't have periods, she lays eggs, the centaur can't eat meat, the lamia sheds her skin, so on and so forth. The author did his or her research, and I'm honestly pretty impressed.
The characters, too, have potential. They're all interesting and pretty fun, and we get hints of their backstories, but we never get much time to really learn about everyone. Rather, We just pile on more and more monster girls. Although to be fair we seem to have slowed down by the Dulahan, and most new monsters come and go, so maybe we'll start to explore more about these characters soon.
The plot is the worst cocktease of them all. So many times we're presented with the possibility of something changing, of someone dying or MC finally deciding on a girl (it's the lamia you idiot, go with the lamia) to marry, but they never go anywhere. The only thing that ever changes is that we get MORE MONSTER GIRLS. And it's not like they never address the issue, no. Not once but twice does Ms. Plot Catalyst tell our MC that HE HAS TO CHOOSE A GIRL TO MARRY NOW. But no, the story must go on, and he has to keep his harem. No one can leave the harem and it never ends. Come to think of it, it sounds like some kind of terrible depressing purgatory. You must pine over this man and get an ever-increasing amount of love rivals for all eternity! NOOOOO!
In conclusion, Monster Girl is a story with quite a lot of potential that will go forever unrealized, and it's a tragedy. Maybe if the great gods of anime past decide to pull a twist and make an interesting and intelligent story rather than sell more half-clothed figurines and dakimakura the anime will split off from the manga and just develop maybe the three first girls, but that's about as likely as Naruto ending.
Wait, what? There's hope!
P.S. Suu4Lyfe