The wife and I have not beat the first one yet so ... shhhh ... no spoilers
We've beat 2 and are currently working back through the game in vault-hunter mode. We also completed everything in the Pre-Sequel before we got the extra add-ons. And I haven't found a 360 game yet that doesn't have flaws. I've literally got stuck in the first borderlands when my character walked off the edge of a cliff. I couldn't jump or move or anything. I had to restart the game. And there's no telling how many flaws we've found in Sniper Elite V2. I'm still finding them once in a while.
Maybe someday I will invest in the Borderlands on PC so I can play along. That's one game I don't mind investing in for any console or computer. Hey...someone needs to make that game for the Atari home computers!