What was wrong with Call of Cthulhu? I'm just curious as I haven't played it yet myself.
My two cents on this:
The First Part: a potentially cool detective mystery game, boiled down to Lovecraft clichés (if you are not a Lovecraft nut, you might love it though - for me, it's just repeating that particular, age-old idea of his)
The Second Part: a totally out of place, scripted action-ridden part, which is supposed to add some deadly tension to the experience. Well, it is not tension, it is pure frustration. (if you are okay with scripted action sequences, you might like it though)
Personal slant: I find the RPG mechanics totally out of place. Your character build is mostly cosmetic, as the main story beats are pre-defined, and not related to your skills. (FYI: the pen'n'paper version of this game DOES WORK, because the DM actively forms the story around your skills)
However, you'll be able to create a totally wrong build, where certain clues will not be deciphered, thus certain background lore won't be explained in detail. If you are a Lovecraft newbie, you will be totally and utterly confused in such situations. If you are a Lovecraft nut, you'll know the drill anyway (see above: clichés), so this stat won't matter that much.
Bottom line: I genuinely enjoyed the first 2-3 hours, but afterwards the game design broke apart in spectacular fashion.