Should I buy?

fun and casual, maybe more targeted towards the younger audience, but I liked both games and 100%ed them both :)

Unlimited was fun, never played unmasked. I assume its more of the same but with superheroes.

Unlimited was bundled, no? I have heard many people say that Unmasked wasn't as good as Unlimited ... more restrictive and maybe fewer levels? The only thing going for it was the DC license.

the games are fun, especially in terms of out of the box solutions (such as giving the boy scout a railgun)

Go for it! Both are fun games.