Yes. A lot of people credit Orton as a great wrestler, because they believe so, and rate him very high. Let's call this group A.
Some people can't find the reasons for those claims, and consider them stupid. They support Cena, and think he is better than Orton. Let's call this group B.
For a person from group A, it will seem as if most people rate Orton rightly. But for a person from group B, Orton will seem to be overrated.
Cena was overpushed from 2005. He beat a lot of talented guys, who put him over. They made him look good/better. Cena's fan-base grew very big, but consists mainly of kids, girls, women etc.,
Those fans thought/still think Cena is the best.
As time passes, Mature fans didn't enjoy his character. They are annoyed by him. His matches doesn't seem believable. His mic skill was annoying, at times, as well. He was overpushed. He used just 5 moves, mainly. His character was never entertaining nor his moves any effective. They are subjected to Cena's predictable matches and annoying promos. They hated him. IWC hated him.
But Cena was the top guy. He had a large amount of fans. And some of them are aged enough to come to Internet and confirm their views. BUT, Cena is hated by the majority! So they reduced expressing their opinions about Cena(that he is the Best), as day passes. Even his die-hard fans had to call him decent at best in Wrestling.
One must acknowledge the fact that IWC hated Cena (also) because of certain annoying Cena fans/fangirls who call him the best because he is hot or they being marks, who think Cena is really as strong as he was/is portrayed. Freedom of expression of Cena fans was opposed by a large anti-Cena army in Internet.
Now we come to 2009. In this year Big Show, The Miz and Orton put Cena over. Orton and Big Show made Cena look better. These things made him gain a lot of fans, who consider him the best as well, but they are not in IWC. Even if they come to Internet their opinions will be 'thumbs down'ed and ridiculed by Cena haters.
So, obviously he isn't overrated or that overrated in IWC anymore.
Now we look into Orton. Wrestling in his blood. 3rd generation wrestler. Great IC Champion. Was in Evolution, taught by the best. Youngest World Heavyweight Champion!!- 24 yrs, can you believe it?
Arrogance/Confidence and Wrestling SKILL made him popular.
Then he turned Face. Orton's Era begun, Orton is God signs. People believed that Orton is the Future!
Then he turned into a cocky, arrogant heel, and impressed most mature fans. Then the Age of Orton, One Man Dynasty. Everything was over with IWC.
Why am I explaining these? Well, at every instant, above mentioned, Orton was considered a great Wrestler by majority. He was known for his Wrestling. Orton fans had the freedom to say that Orton is a great wrestler in IWC.
But this year, he received a massive deserving overpush.
Some think he is not that great wrestler anymore, as he reduced his move-set after injury. Some consider him boring on mic. Some don't understand his character. Some can't bear the Legacy.
So, some fans changed their opinions on Orton, but still like him more than Cena. Some fans started hating Orton and they think Cena is better than Orton, now.(Thanks to Cena supporters)
But still Majority of IWC thinks Orton is better wrestler than Cena. I don't know why. But I can tell you why I consider Orton a great Wrestler.
He has a small but aggressive move-set. All of his moves are effective. He executes every move well, or atleast looks very confident while doing so. He is calculated inside the ring and focuses his moves on the head/neck area of his opponents.(Technical)
His moves are entertaining, and only so majority don't complain about his move-set though being small, while Cena gets all the hate.
He shows a variety of expressions during matches, which entertains/engages many fans and make them get into the story-line more and more. Though, this comes under portrayal of character more than wrestling skill, I presume. But it is a move-set of Orton(IMO).
Now comparing with Cena: Better selling. Better, effective Moves. Orton's scoop slam is more effective than Cena's finisher AA. More believably booked. Unpredictable, while Cena is the definition of predictability. Technical, while Cena is just a brawler. Better reflexes. More talented(IMO).