To be honest, it doesn't add anything new worth to mention to the experience of the original classics, other than cool multiplayer (which I can't make work on my computer) and the merging of the 2 original games.
To tell you the truth, I recommend you to download it from The Pirate Bay, play it through and compare it with the originals (available on MAME). Just some visual filters don't make the graphics prettier.
I love this kind of arcade games (D&D, Dungeon Magic, Crystal of Kings, The Astyanax...), since I'm totally into fantasy and medieval stuff, but this one felt like a generic rehash to me. Just a little more than what you get emulating the original.