I play
SW, and personally LOVE my Vindicators. I always take at least 1. Part of the reason I love them is they fit the aesthetic/theme of the Space Wolves, blunt, in your face, and kicks out a gak-tonne of pain.
Also it's the only way I can get hold of a str10 ap2 pie plate outside of
FW. In at least 2 games with them I've blown up my opponents Land Raider the first time I aimed for the unit next to it. So, scatter dice hate me, but apparently my Armour-pen ones love me
I've never really had an issue with them dying turn 1 or 2, possibly because the guy I usually play against doesn't have much in the way of anti-tank, and he also rolls poorly. However, others are right, with two, the probability of at least one pie-plate surviving increases drastically, and can even be a game-changer right up until the final bell.
I love me a vindi, end of