2-7 worst hand?

[slickpoppa]

Ok, so every announcer on ESPN likes to remind us that 2-7 is the worst starting hand in a multiway game. I'm not saying that it isn't, but has this really been PROVEN mathematically? Is it even possible to? 2-3 can be a slightly better hand to play becasue it can make more straights, but nevertheless, 2-7 will win more often against 9 random hands all played to the river. A better standard for determining which is hand is worse would take into account more realistic betting scenarios. But any simulation you come up with is arbitrary and every game of poker is different.
In the end it doesn't really matter, but the math nerd in me is bothered when people say something like it is a law when it is really just conventional wisdom.