I wrote that? Are you sure that wasn't one of the other Bayern supporters on here? I think that sounds a bit over the top and if I wrote something like that I was a bit off. I haven't read through the whole thread, but if somone is interested, here's my opinion on Gustavo:
He started last season on fire and for the first time looked like someone who can actually consistently contribute in the build up and in attack apart from the odd long shot goal. It was all gone when he came back from his injury though, so there's a good chance that those brilliant weeks lead to him being a bit overrated in his overall ability. Our opponents were completely surprised by our pressing, so he had an easier job than the year before. When teams adapted and Schweinsteiger wasn't available, we pretty much sucked. The few times Gustavo and Martinez played together, we were incredibly shit in possession and it was mainly because Gustavo did feck all contribute in attack (the losses to Bate and Arsenal come to mind). I really, really like Gustavo and in a team that doesn't focus primarily on possession, he'd be brilliant, but he was always a bit of a problem in our style, he was quite expensive but van Gaal rarely played him in midfield, most of the time he started as a left back or centerback. Heynckes' made very good use of him though, mainly because with Kroos he played a third CM in midfield, who dropped deep regularly and helped Schweinsteiger in that area. I doubt we could have produced last season's end of season form after Kroos got injured with Gustavo instead of Martinez in the team.
I don't really understand why some people think he's not good enough in general though. He mainly doesn't fit in Guardiola's approach (which is heavily criticised on here anyway). His vision and his passing are clearly overrated by some of the muppets in this thread, but he's no worse than Sven Bender for Dortmund, for example. The manager needs to decide what role he wants him to play and in which way the team will play against the top teams in the league and in europe (especially against teams with great pressing). He's a brilliant ball winner and his passing is okay when he's given enough time on the ball or when it's enough to play the easy pass to someone who's actually good on the ball, but he will struggle under pressure in a possession game.
If United starts to use Kagawa in a way similar to what he played in Dortmund, someone like Gustavo next to Carrick would be a perfect fit. If Moyes wants to play Kagawa out wide with someone like Rooney in the middle, I think you need a different type of player - just like Bayern need a different type of player, when Müller is playing behind the striker. Both ideas can work brilliantly, imo, it's just a different approach to the game and I don't know which fits the premier league and its style better.