I really disliked Dan Quinn going for it before the half, and it likely cost him his QB for yet another year.
To be clear, I didn't like it before the injury. I think in the NFL, you generally take the points unless you're forced to go for it at the end of a game. You're moving the ball well, your QB is playing well, and you get the ball to start the second half. You don't have to try to tie it up at the half. Take the 3 points and go to the locker room down 4. Again, you get the ball next.
The fact that he screwed his team for the rest of the year just compounds a poor decision to a disastrous one.
As for Daniels himself.....I don't know how many times you can injure the same joint before the league decides despite your potential, you just can't play in this league. He's going to find himself having been a productive player, who is out of a job.