Strength of schedule! Strength of schedule! How about watching the game with your eyes?
This is the deepest Gonzaga team, ever and probably the most well built team they've ever put on a court. They play in a weak league, yes, but they also do exactly what great teams do in bad leagues, beat the living hell out of nearly ever opponent.
If you really follow Gonzaga, like, really follow them, you've seen the ups and downs this program has gone through. When they first got good, it was with three point shooters and scrappy guys down low. They were exceptionally well coached, but they won with smoke and mirrors and significantly less talent then a lot of the teams they played in the tournament. Then, they raise the national profile and expand their recruiting base. From 03-08 you saw a lot of really talented Gonzaga teams with NBA quality players and absolutely no character or heart. These were the Austin Day teams, Jeremy Pargo, Josh Heitveldt(sp?). The program lost its identity and has been slowly regaining it for the last three years. Now they've got the scrappy guys, the multifaceted big men, the intelligent point guards, the NBA level athlete (Harris). They have a flurry of guys coming off the bench, everyone knows their role and everyone plays together.
Its easy to write off this Gonzaga team as all the others that stumble in the second or Sweet Sixteen because its convenient and everyone is in "wait and see" mode with them. Depending on who they draw, they could run into some trouble in the second round or Sweet Sixteen, it's all about matchups. When they've lost, its been to teams that pressure the ball and force Gonzaga's point guards into creating off the dribble. On defense, Gonzaga has trouble defending the pick and rolls run by athletic guards, a team like Michigan would give them headaches.
I don't think they are the best team in the country, although they could definitely make a final four run, but this is the best Gonzaga team I've seen.