I beat Red Dead Redemption a week or two ago (and recently hit 100% completion for single player) and decided to type up my thoughts on the ending of the game.  There's obviously some spoiler discussion in there and I don't want to ruin any of it for anyone, so my thoughts are linked below. 
http://www.giantbomb.com/red-dead-redemption/61-25249/thoughts-on-the-ending-spoilers/35-420452/  
 
My none spoiler thoughts on RDR: 
This is a really fantastic game.