Personally i think Madden is the best sports game ever created. Some argue that it only has modest changes each year (besides rosters) and is pointless to buy each one. Well not only do the graphics get better but so does the game. I wouldnt play it on any other system, 360 ruined my non ps2 experience. The graphics were nice but the gameplay sucks.
Thanks

All Madden games are good but I usually just buy a year back becasue I can get them for $15 instead of $55 so like you said it is not really worth it to go and buy the brand new one each year.