Anyway find it strange that people keep mentioning Pollard as a reason to fear West Indies.
He has been fairly useless in the IPL and that's against far weaker bowling. His game doesn't seem to work that well against higher class bowling.
West Indies probably have the best T20 batsman and bowler. But they also have some of the worst players in the format. Guys who are just filler. Their batting is massively over-rated. You have Gayle, some mediocrity and sub-mediocrity, Pollard and Sammy who've not come off remotely as often as people think and Bravo who's a good finisher. Gayle aside it's a below average line-up. Gayle's globetrotting T20 career includes lots of instances of him averaging 40+ at 150+ SR whilst his team finishes in the bottom half. The bowling is where West Indies will win games, I think that matches up well against the sides who aren't from the sub-continent, but is not quite as big a threat against India, Sri Lanka and Pakistan.