Crisis Core's a great game, and despite its flaws (and there are a few), I recommend it for everyone.

It has a fair replay value, but the thing that sucks about that is that you can't skip the cutscenes or any dialog in them, and there are a ton of cutscenes in that game, so while you're playing through again, don't be surprised if you find yourself just walking off and doing something else while a cutscene going. It's seriously that bad.

The story's also pretty linear, and there never seems to be a good, designated time to do any side quests; you pretty much judge for yourself and just abruptly stop doing whatever the story has you doing so that you can take care of any side quests. There's really only one side quest, and it's just 300 missions, and I guarantee you: it takes longer to complete those missions than it does to go through the story in Crisis Core, and most of them are honestly very boring, but the rewards from completing them are incredible.

Oh, and the game's original score is just bad.

Those are the heaviest flaws I can think of, but overall, I think the pros of Crisis Core definitely outweigh the cons, and it's a great game. Get it.