Players who are hit by these abilities play less of the game. Sure, I guess you can have a personal taste that "playing less of the game is fun", but at that point I would question why you're playing the game at all?
1rst, I think you're exaggerating how much less of the game they're playing, and
2nd, the answer to your question about why I'm playing the game is:
A) for the challenge, which includes the possibility of being hit with negative effects or (gasp) even being knocked out or killed, and
B) for the escape into the story.
Basically, we have very different philosophies on roleplaying games. I accept that you have your own version of fun, but to me, the idea of putting restrictions on the DM to make sure I'm always awake and participating every turn isn't a good time. Sometimes my character gets burned and I have to sit one out, or even make a new character. It happens, and I don't begrudge the system. In fact, it's part of the enjoyment, the challenge, the repercussions. Let the dice fall where they may.
