A few rambling initial thoughts, after not much sleep, and before rewatching any of it... (I reserve my right to contradict myself and change my mind without notice)
Argentina were deserving winners. But they were pretty limited, and didn't do much - just were better than Wales. We were pretty poor all game. Hugely disappointing, after we'd put in some really solid performances in the pool - but this kind of level is where we've been for a while, so given how we looked 6/12 months ago it's no shock.
Wales' best period was the first 20, where we managed the game well. But so many mistakes - handling errors mainly - meant that we only scored 10. Felt like we missed the chance to score more in that period (although to be fair so did RG). After that, we couldn't get any control for pretty much the rest of the game. Our kicking, which had been really smart and well executed against Australia, was pretty poor. Handling errors, crap line outs etc. So many of our senior players had really poor games.
Honestly can't think of much to say about Argentina. They played well enough, and smart enough, to get past Wales, but that was a low bar today.
Game was enjoyable enough, but quality was so far below the other match - the semi will be a formality if both teams play like they did today.
Still dumbfounded about the decision that it wasn't even a penalty for the hit on Tompkins. I need to watch it again before I whinge too much, but my impression at the time was that it was reckless - although Tompkins was falling at the time, so certainly some mitigation. I get what MtS says, it could have changed the outcome. But that's true of many reffing decisions during a game. If it had been a high quality, high intensity, knife-edge match then I might be furious about it. But there are so many reasons we lost that were within our control that it doesn't seem right to just focus on one that wasn't.