You need a Buddha level of willpower to not get frustrated here. I often hear competitive Pokemon players describe the game as, "Chess but your pieces are dragons." yet no Bishop has a 50% chance to sleep, poison or paralyze you. It's possible to become better at the game by taking these percentages into account and minimizing their possible effect on your strategy, but no matter what there's also some randomness.

Casually the game is very fun though. Easy to make a team, lots of different formats to try, plenty of resources to help you understand the huge amount of knowledge needed to be decent, and overall it's an incredible feat that this is all free and fan made.