I have tried to use the computer analysis of games here , but it hasn't helped me much. I always feel I should be playing Checkers, after it points out that 35% of my moves are mistakes and another 10% are inaccuracies! Then the analysis shows how I could have gotten more from their preferred move, that is a dozen moves Deep.

Does anyone know a good site for playing Checkers?

My guess is checkers.com :)

I often feel dumb when I analyze a game, either I have blundered somewhere or my victory is a result of the opponents blunder.

But I do find the analysis useful, it helps me see what I could (should) have done better.

It is depressing, partly because it only makes negative judgments and comments. I sometimes think it will start saying things like 'you are a worthless human being' and 'people at work laugh at you behind your back', and so on. But you can turn it round: it analyses at 2500 level, that is strong GM level, so every time it says nothing, you have played at that level yourself. Is this unique to chess? I can't say to myself that if I were playing football I would play well enough to be part of Barcelona or Man U (except in straightforward fantasising), but when the computer analysis says nothing, that's what you're doing. So if you have your 25% mistakes and 10% inaccuracies, or whatever, the rest of the time, wow! For an hour of a ninety-minute football game, you were Thierry Henry or Wayne Rooney! 

That happens to me with my chessmaster. It analyze just certan no. of moves in front. So I had situations where I am in wining position with great pawn structure and in mate in one for my opp.

HiStreptomicin, thanks.  I'll look more at the move I made being questioned by the computer analysis but definately calculate out my own variations off the computer's suggestions.