Thanks for the clear responses!
Imagination and knowledge is always a limit regardless of what you use to build a game.
I guess, from the replies, the only 'real' limitations are multiplayer and 3D.
It sounds so nice not to have to program, or rather not to have to program every little thing just to get a movable sprite on the screen. Back in the day I used to make games with RPG maker, not sure if this is similair to work with but I'll defenitly give this a try.
The only thing I wonder is, the code will be generated from the C2 editor so to speak. How optimized is this code?
To give an example, say you'd build a site in dreamweaver with the WYSIWYG editor, not that you should, but just for example's sake, the html/css will be bloated and in a sense slows down the website.
Is this the same with C2? or does it try and strip away as much as possible when 'compiling' a game?