It would be interesting if it were possible.
Tactics trainer ratings for puzzles are calculated the same way that ratings for players are. If the puzzle 'loses' to a player, it loses points. If it 'wins', it gains points depending on the difference between the puzzle and player's ratings.
I would love to see a rating given with game analysis,for the strength associated, with each move that is made in games by each player. I think this would be a telling statistic. It would certainly indicate at which point of games you play at your weakest, so you could better try to attack your weaknesses. It also would help to show patterns to your opponents moves, to better help you take advantage of the prospects of playing them again.
I think that some people will think this idea isn't feasible/accurate/necessary,etc. However,I tend to think there are others who would welcome it. I am sure it is possible considering, both the tactics trainer and the mentor associate a rating for puzzles. These puzzles are sometimes only one move puzzles.
Having the programmers work it in, is perhaps another matter entirely, in terms of its feasibility, but if it helped us to see what moves are better in each situation more clearly, as well as how to play certain opponents, or what ones to avoid, because they don't suit our "style" of play, then I think it should be made to happen. I welcome your reactions, yeah or nay...