First off I should point out that even if you are only interested in one or two colognes you should still get this because it will save you a lot of money and the cologne bottles are the same size as the ones sold individually.
That being said, the colognes themselves are surprisingly good for what is essentially a novelty item (Not a toy, please re-list correctly Amazon).
Captain America - Patriot
This just seems like a solid scent. It's pleasing and simple. Good for any occasion and I don't think anyone could object to it. An all around good smell, definitely fits Captain America.
Iron Man - Mark IV
Honestly, it's a lot like Patriot. That's not necessarily bad, they are both really good smells, but its the kind of smell I would expect from a cologne. Elegant and confident. Just like Iron Man
Hulk - Be Angry
This is one they really did something different with. It's a strong smell that really evokes the word "powerful". I cannot think of a better way to describe it. It's also a good smell, but quite different. A good smell for Hulk.
Thor - Worthy
This one might actually be my favorite. It smells very much like a forest. The "Woody Citrus", as the maker describes it, is definitely there, and what I like is that it makes me think of masculinity, which really fits Thor well.
If possible, I would highly suggest smelling them for yourself if you get the opportunity. Smell is so subjective that its hard to say what everyone will think of it. If that is not an option then I think you will be happy with this regardless. Its a lot of good cologne for a great price.