I have mixed feelings for Orton.
I think he is very capable in the ring and puts on some very good matches when the chemistry is right (Christian, Undertaker, etc), he has one of the best looks in WWE, he DOES put guys over contrary to popular claim, and I think his abilities on the mic are there but the intense Viper gimmick hinders that a bit.
... Which brings me to what I don't like about Randy. Basically, he's stale. The Viper gimmick is restricting and one-dimensional, forced down our throats to the point where he has become predictable. Over the years of Orton's career I've loved him, hated him, loved him, etc. in a loop with every turn and change to his character. And I really enjoyed that, I liked the fact that I couldn't even pin down my opinion of Orton in any solid way. He was always changing.
But that has stopped. He's had the Viper-like persona for a few years now and been a babyface for a couple of years to date, but my problem is that he has stopped Evolving and changing. If I'm going to enjoy Orton again then he needs to do something new, and I'm not just talking about a heel turn. He needs some kind of overhaul.