I wouldn't use that VRT thing as an excuse, but at least it affords a chance to get around bugs. It's come in handy for a lot of things, including the healing bug for me, which really sucked. I have a party I created that only goes through each scenario until victory and doesn't farm good stuff for good cards. Even with the bugs (and sorry, obz, there are many) I managed to get through all but a couple of scenarios (like honestly two) on the first try. Deck five looks really tough, but I don't think I had to repeat any of those. Well... I'm a bit forgetful at the moment, so maybe one of the times I suffered defeat and had to start again was in 5. Anyhow, I don't generally mind having to repeat a scenario. It happens. ...And I have yet to see a scenario where, if you're a belt and suspenders kind of guy, you need ever suffer a character's death.
With that said, I think there's something qualitatively (if not quantitatively) different about getting screwed because of a bug rather than your decisions. If you lose, you should lose because of some decision you made, rather than a glitch in the game. On the other hand, the game is random. On the few games with my current six character build where I lost, mostly it had to do with luck anyway. I'm not excusing bugs. This VRT is a pain and clearly it should be fixed, but as long as you don't lose a character on permadeath mode, you can just throw yourself once more into the breach dear friend, because your death won't be lasting.
I'll end by saying, as coherently as possible at this point, that I love this game. I've played many many hours of it and I still play it almost daily. Fix the damned bugs and you'll make a damned near great game damned near perfect!