I bought Borderlands on sale and I've enjoyed it, more so than most games. In fact I've played more of it than probably any other game I've bought this year.

BUT THEN.

I reached the Armory Assault mission and didn't complete it before the timer ran out - I freely admit it was my own fault, I was being greedy - and so I died. I'm now locked out of the Armory and can't complete the mission, and all of a sudden I'm pissed off with the game!

It's not even the core game, it's part of the DLC, but I now feel like I'm done with this playthrough. I might go back and start a newgame+, but this playthrough is now over to me. And all because of one broken mission. It's such a polished game, and this is the first bug I've experienced in it. Am I being unreasonable?