I'm Scottish so I defo won't be biased.
Sure he's over hyped, over paid, over popular.
But is he a good footballer? Yes. You don't play for Manchester United (regularly season after season) if you're not. Sure he doesn't have a lot of pace, he doesn't have the silky skills of Ronaldinho but he is one hell of an effective crosser and passer of the ball and takes perfect free kicks, he's won so many games and played many vital roles in games for club and country. The career he would've had if he stayed at Man United is not worth thinking about.
He's not the best player that ever lived but sure he's one of the most effective hard working players that ever lived.
Is he still effective? He's as experienced as you get maybe he's not the player he once was, he is 33, but he's still world class, he wouldn't be playing for AC Milan if he wasn't.
Love him or hate him you have to respect him as a footballer.