It is just you, but I do like the older games designs. Muk for example has a great design as really intimidating pile of sludge with a lot of personality. It seems like it could eat you at any moment. A design does not have to complex to be good.
I think Gen V has the best looking pokemon overall.
All the pokemon look stupid and the names suck too. For example: Alomomola, Elgyem, Roggenrola... like wtf? Just about every 5th gen pokemon name sounds really awkward to say. I enjoyed 1st, 2nd, 3rd gen, and 4th was alright. I haven't even played the 5th gen, but just looking at the pokemon makes me not want to. How can I get attached to a pokemon named Alomomola? Not to mention the pokemon probably looks like a deformed lamp or something. I can't imagine how awful 6th gen pokemon will look and what their names will be. You might as well name the pokemon Smitty Werbenjagermanjensen.
Kyurem is pretty cool looking but maybe a five year old came up with the design.