First, let me say that this is entirely unscientific (no stats or data), but an off-the-cuff thought...
In the NCAA tournament, they always say that great guard play is necessary to advance. Okay. So does that translate to the NBA playoffs? I'm not so sure, but I think so. Given that assumption, look at the starting back-courts for the remaining playoff teams:
Boston: Rondo/Allen
Cleveland: Williams/Parker
Orlando: Nelson/Carter
Atlanta: Bibby/Johnson
Phoenix: Nash/Richardson
San Antonio: Hill/Parker/Ginobili
Los Angeles: Fisher/Bryant
Utah: Williams/Matthews
Which team has the weakest back-court? For my eyes, it's clearly Cleveland. All the other teams have 1 (if not 2) legitimate all-stars. Mo Williams was technically an all-star, but he's really just a Magloire all-star (in honor of Jamaal Magloire), so he doesn't count. And then you've got Anthony Parker who, in my opinion, is a fringe starter at best.
Again, this isn't scientific, but if the value of guard play translates to the NBA like it does in the NCAA tournament, Cleveland doesn't look nearly like the favorite everyone expects them to be.
Looking at it from a different perspective, can you imagine Cleveland if they swapped Williams/Parker for any one of the back-courts listed above? You'd have to think that team would be a shoe-in for the title, no?
Anyhow, I believe I suggested in an earlier thread that guard match-ups in this series would be critical and that Boston clearly has the advantage here. So far, that seems to be what's happening on the court...