2 card games, pokemon, merchant game, and 2 rpgs you mean? As for my opinion: They're only made to make money. There's no fun in them at all. The creators don't allow you to play the full game without paying.
there were 2 rpgs? i only noticed the pixel one, was afraid to even try thought the very sight of it brough back some pleasant memories The card games aren't so bad though - Clash of the Dragons is a little oversimplified and can't be played for too long in one streak (energy runs out fast) without paying, Kingdoms CCG has its flaws, mostly gets a little repetitive, but it still requires thinking and I quite enjoy it