Dont take notice of the poll results. I would listen to what most people are saying.
You cannot compare a machine thats been around for years, has had hundreds of thousands of games, very polished code, and still stacks up as one of the best Pro's ever released, against a machine that no-one other then in Stern circles has yet to play or review (and most importantly you!!!).
Also, player comments toward MET as 'its all bash, bash, bash' either only played on old code, or didn't bother to really learn the code.
As most of the comments suggest, go with your first gut instinct and dont get caught up in the hype train.
Metallica is a proven fantastic game and Iron Maiden may end up being one also, but if it does then Stern will be making them for a long time so nothing lost.