I still maintain Portal 2 has the greatest narrative in all of video games - it’s expressed purely in gameplay, it’s funny as hell, and has a surprisingly deep emotional core.
It's not my favorite game, nor the favorite of anyone I know, but I'd be willing to guess it's worth top 3 (or at least 5) for almost everyone. Which is to say, in a first-past-the-post scenario it wouldn't win, but in a run-off-vote scenario it may very well be the best game ever made.
It's really not useful to make top n lists. As soon as there disagreement, distinctions and catagories evolve. Its probably sufficient to simple state you enjoyed the game, and to highlite some aspects you enjoyed.
This is, of course, a matter for debate, but as a huge Monkey Island fan, I think Portal 2 is funnier, at least in part because of the excellent delivery of the lines.
Regardless of which title you think is better, though, I think the morale is clear. Never pay more than $20 for a computer game.
