I wouldn't consider a vindicator to be a good value as an anti-tank unit.
At BS4, anything with an autocannon, mobile multimelta or missile launcher is a better value (and more effective) against AR10-12. So you're really only getting use out of a vindicator against AR13-14 targets. Those targets pretty much all either have guns that outrange you by a lot, or troops inside who will happily assault you after you take your one shot. Even if your shot doesn't scatter off and you get a pen, you can still roll a 1-3 on the damage table and have no significant effect.
A 50-60 point multimelta speeder or attack bike is much more effective versus AR13-14 targets, hitting 2/3 of the time and scoring a crippling result on the damage table on a 3+ (2+ vs. a battlewagon). If you're going to suicide anyway, it's better to spend your 150 points on three shots instead of one.
In my experience, two or three vindicators doesn't improve the value either. With a mobile army, I don't have any trouble shutting down 2-3 vindicators--usually in the mop up phase since they're ineffective enough to make them relatively low priority targets (only inexperienced players fall for vindicator spam as fire magnets). There's no way to hide the side/rear armor against a mobile opponent, and absolutely no way to hide rear armor from krak assaults.
Best way to deal with monoliths is to shoot & assault the warriors to go for phase-out. If you're shooting a vindicator (or 2-3 vindicators) at a monolith, that's probably unwise target selection.
In a chaos army, where you don't have mobile multimeltas, maybe. But for loyalist marines, I think the combination of autocannons, missiles, and mobile multimeltas outclasses vindicators.
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