I don't think going up against the film 'Valentine's Day' will be too much of a detriment to 'Wolfman'. The argument presumably being that couples would rather go to that, or get dragged to see it. So the 'R' rating doesn't figure in this comparison then.

The comparison to 'Watchmen' is very fair, but Watchmen had so much hype and I think a lot of people who didn't know the novel were asking themselves "why? and who cares?". Watchmen really looked like a comic book, "fanboy" movie. With 'Wolfman' the title itself is pretty self-explanatory and therefore already a potentially better draw than Watchmen. But 'Wolfman' almost certainly won't get the $55 million opening weekend 'Watchmen' had.