Don't feel too bad. I have been knitting for about 4 1/2 years now and i still have yet to knit something other than a scarf or a hat or a purse that i love to wear. My sweater I am currently working on has been frogged three times already and is on its way to the frog pond yet again (4th times going to be the charm!
Sometimes i think its yarn karma... or luck. If you hate it even after you put on the other sleeve, just rip it and use the yarn for something different. Its the beauty of knitting, if it doesn't work out you can start over... and curse at it. Plus if you throw yarn/ projects at the wall they won't break and its very theraputic
Good luck on your next project!