There was, like, only a few people picking on Serperior.
You're entitled to your opinion, but I don't hate it for the whole "From arms to no arms" business. I hate it because it's supposed to look pretty and regal, but looks ugly. ...At least IMO.
Design Wise: Basically Pokemon that try to be something but fail are, IMO, a failed design. Another example would be Skitty and Delcatty. They're supposed to be adorable, despite the fact that they're really not. ...Again, IMO.