Chances of fight being a letdown?

I think it all really comes down to how Pacquiao approaches this fight. If Manny decides to make it a thinking boxing match and pretty much lets Floyd dictate the pace, then we'll get a lackluster fight with little action. If he goes for broke and puts on the pressure and plays the aggressor from opening bell then we'll get an intriguing and exciting fight.

Floyd will come play in safe first defense and be down 3-1. Most people will say 4-40 Floyd will begin box and win 2 close rounds. then lose the next 2 ,one with being knocked down. The end of the fight will be boring. A draw

Very little chance, Mayweather is more offensive minded against southpaws, his offense clicks better against them. And it's Manny Pacquiao we're talking about. Very little chance.

if you're a pacquiao fan - very high

High I'd say. Quite a few people agreed that Lucas - Provo was going to be the fight of the year even before it started, so I'm guessing hardcore fans already have an idea.