Attractive football is subjective, some people think route one football is attractive.
I personally think that Arsenal is the only team that plays attractive football in the Prem. And I think the attractive styles of play are in Argentina, Spain, Brazil, and other Latin American countries. Maybe Holland and Portugal. Also, I don't think ManU play attractive football. They usually play a very good team game based around hard-working, athletic, fit players (Park, Giggs, Rooney, etc.) some physical players in the midfield, a poaching goal scorer (Van Nistelrooy, now Berbatov), and a creative player (Ronaldo, now Nani). They usually rely on pace and the counter-attack to punish teams that play too offensively. They're very efficient and it's a great system but I wouldn't call them attractive, especially in the Champions League. That's just my opinion though and it's totally subjective, but I'm sure a lot of people will get ****** off reading it.
I really admire Guardiola and Wenger because they want to play attractive football no matter what, even if it costs them results. Or Valdano, who would fire a manager if they won if it was a boring on the field product (Capello). It's too bad the Mourinho's and Benitez's of the game are what's common these days, and at the end of the day, the tactical managers usually can win, especially if it's a two-legged draw. But can they develop players? Often times they can't.