I've played some of them. They're typical Square. If you like other games by Square, you might like them. If you DONT like games by Square, avoid them.
They're very... button-mashy. There's not exactly much strategy or thinking involved. You have items and such to find and equip and whatnot, but again, this is Square, there's never all that much to that aspect either. Not hugely challenging games, unless you're going after some of the special bosses and such.
The series is VERY big on cutscenes and spectacle. And be aware, you will not get a full, complete story with it. There's no big satisfying conclusion at the end. Nothing gets wrapped up. Even if you buy ALL of them you still wont get a complete story. Nor will you get a very coherent one. The storyline is seriously all over the place. Hell, it can be hard to tell WHEN each one takes place. On top of that, if you havent played the earlier games in the series, expect boatloads of confusion.
There's a good amount of content in each (usually) and they are fairly long. The gameplay can really drag on sometimes though.
Overall I would put them as "decent". There's fun to be had there and some darned awesome moments (such as the whole fight with Xemnas at the end of the second game) but they're kinda shallow and can get pretty repetitive. Not to mention that sometimes your AI allies just arent going to act in quite the way you want them to.
Now that all being said: Keep in mind that times have changed. It's been a LONG time since KH 2 came out, and in that time, the industry has become more and more corrupted. Square isnt like EA or Activision, but they still shouldnt be trusted. Wait for reviews to come out before buying. And I dont mean the sort of reviews that come out 2 days after. I mean reviews from people that have played the entire thing.
Hopefully it wont have any nasty monetization.
