I don't know where you heard about cryptokitties and other ethereum games, but they are not scam. It's a collective game with microtransactions.
It's just a game and they are not stealing people's money. They have done a great job and many other projects just copied them.
Eth network had problems when cryptokitties released, but it was just for a few days/hours and never happened again. It was a good network test and was positive for the network. If ethereum is to grow, many games like this are going to be online
I agree with your argument, there is nothing to doubt about eth, but everything only affects the circulation. sometimes there may be interference when the network circulation is full, or stacked. then we can only wait and follow the queue.