I hope no one kills me for this, but as cute as Oshawott is, I actually find it the least appealing out of all of the water starters. I will not deny it's cuteness however, and at least thats a good thing, right? n___n;
First form: Oshawott. It's still cute in a derpish way, but the least so out of all the Water Starters.
Second form: Croconaw. Never really liked that caveman dress it's got going on.
Final form: Swampert. Looks the least appealing out of all the final forms to me by far.
General: Mudkip. It's got interesting typing as Swampert and decent battle ability, but its evolutions have pretty poor designs as far as starters go.
Squirtle was the very first Pokemon I choose on the very first Pokemon Game I ever bought, Totodile is cute too and Feraligatr rocks, Piplup is sooooo cute and Empoleon is easily one of the best of Gen.4 deffensively speaking, and I actually have grown to like Oshawott a lot I don't get why all the hate. I have no words on Mudkip since I never choose him as my starter on R/S/E it was always treecko.
I seriously like all the Water starters (I always go with the Water starter for some reaon. It's just uncanny.), but if I really did have to choose which one is my least favorite, I'd probably choose Piplup. No reason given really, it's just the one I love a little bit less than the others.
Mudkip. Don't really hate it, but it never worked as well as the others. Overall, I found it to be the worst Hoenn starter as well. SMH, no starter has ever been able to live up to Squirtle, though Totodile and Oshawott came close.