Pittsburgh is injury riddled and not very good. Marquette is average and will be out of the top 25 soon. Villanova is VERY overrated and won't be in the top 25 after this week also.
Arguably the only deserving top 25 teams are Georgetown and West Virginia.
The Pac Ten, Big Ten, SEC, ACC, and Big 12 all have more top 25 teams. I can't think of one team other than Georgetown that can truly compete for the final four from the Big East this year. I can think of multiple teams from the ACC, SEC, Pac Ten, and the Big Ten that can compete for the final four.
How can you honestly say that the Pac Ten and Big Ten aren't better than the Big East? UCLA, Washington State, Stanford, Az State are all top 25 and UCLA/Washington State are serious final four contenders. The Big Ten has three teams in the top 11 in Indiana, Wisconsin, and Michigan State.