Are you saying people have argued that Geno had a more successful career than Russell? Or do I misunderstand your meaning of the phrase more successful? If so, I'd love to see an example.
Again, I don't view this as Geno vs. Russ. I am pro-Geno because he's our quarterback and grades out reasonably well. He battled a significant injury last season and set the NFL record for comebacks in a season, yet about 40% of our fanbase acts like he's a replacement-level starter. They call his pro bowls a joke and dismiss his rankings: PFF, QBR, SR, etc.
I am not anti-Russ. My only thoughts on Russ are that he and his camp handled the Let Russ Cook situation poorly. It seemed clear that many of the Seahawks' offensive problems were as much his fault as anyone's. And his post-Seattle career has been such a trainwreck that he'll probably never win that argument. Also, let's be very, very clear. Russ brought most of the hate on himself. He tried to get his GM and coach fired, threw his teammates under the bus, and forced his way out of town. It's not like he left amicably, and suddenly, people started throwing shade at him.