I finished the main campaign in Borderlands (DLCs pending yet, but I don't think my answer is there), I reached the Vault, was expecting riches that'd blow my mind, and all I got was one big monster.
Perhaps I missed it in some dialog, but what was the point in opening it for that? Was the plan of the woman that guides you throughout the game for you to kill that monster?
She even says that the vault cannot be opened again for 200 years, will the monster re-spawn then and has to be killed again?
Was the monster protecting something? If it was, why not entering the vault after killing it?
I really liked the game but was disappointed by the ending (or most likely didn't get it).
Best Answer
It is true that the Borderlands ending is one of the most disappointing endings that a game ever had. Quoting Paul Helquist, senior designer:
So what I presume is that they will dig deeper into the story around the Vault in Borderlands 2 (released somewhere between 04-2012 and 03-2013).
To give you a little bit satisfaction from the ending, consider this explanation I found on the web a while ago, that made the ending slightly more acceptable:
I do hope that the ending in Borderlands 2 will be a better one than its prequel's.