I very much understand that, and you very much don't understand that 3 good games in 20 aren't a good indicator of anything.On his good days he has been MOTM. In what way is that average? Players progress at different rates. You seem to not understand that. Check out the comments from fans on this sight after his best games this season.
He might, MIGHT, make it as a good player in the Prem, but he's got a lot to work for and "is big" is not a Prem quality, we need more than that. He bosses championship teams like Forest and Wolves because that's his level - Newcastle, Arsenal, Chelsea bypass his existence and bully him, as there's more to football than being tall. I'd love to see him have more good games but based on the evidence so far he needs to work quite a bit and pull a skillset out of his backside.