RegJr
Freaked Out
Personally, other than height, i don't like Mafex version, he looks skinny and doesn't impose. But I'm of the very few people who doesn't like him at all, everyone else seems to love him...
You're not alone. My friend at work has both the MAFEX and SHF Vader figures, and I really dislike the MAFEX version. The helmet sculpt is wonky, and he is way too thin for my tastes; Vader should be much bulkier. This is also my complaint about the SHF version: too thin and lean.
So far, I still consider the Hasbro version to be better than those two (gasp!), since it has just the right amount of bulk. And if you repaint the helmet of the Walgreens-exclusive offering, you get a much-improved helmet compared to the standard version.