he's a clear-as-day replacement for Giggs.
excellent transfer for United, as they really lack left-footed poise when Giggs doesn't play well, which given his age is happening more frequently. Macheda just isn't progressing in England and needs a change of scenery, and Fabio needs games when he can get fit, so going on loan makes sense.
Gaitan isn't worth £20m but he has the potential to be. and when you buy from Portugal you ALWAYS pay for potential.
if they keep Nani they have an absolutely devastating wing corps for next season with Tony V, Young, Nani, Gaitan and then Giggs on the periphery. but I dunno, part of me thinks they'll sell Nani as he's such an inconsistent muppet, but I guess he does have superb talent and you never want to give up on that.
they still need to replace Scholes though.