I never much cared about gamerscore. Achievements are cool because they A) Give you a small incentive to pursue side stuff you might not otherwise care about, like finishing off collectibles or whatever, thus extending the fun of a game and B) Serve as a nice reminder of the games that you have played and finished. Services like True Achievements and the PS4 also tell you how many players completed a given cheevo or trophy, which can be interesting. I have no problem with achievements.
But Gamerscore attempts to quantify achievements and it does so in a weird way, letting developers assign score (previously based on whether the game was retail or XBLA) regardless of difficulty or length of the game. It was always a dumb idea, since finishing some early 4 hour games would net you a thousand points while other achievements have ridiculous requirements. Microsoft, however, at least tried to compensate for this by assigning different numbers of cheevo points for downloadable games, which at the start of the 360 generation tended to be smaller in scope, if not always easier.
Downloadable games got a lot more complicated as the generation drew on (From 50 Megabyte maximum sizes to 2 gigs or over now, and from Geometry Wars to fully fledged story-based games like Shadow Complex.) Last year Microsoft lifted the points max of XBLA games from 200 to 400, which made sense for a game like CoJ: Gunslinger but maybe not for Brothers or Zuma's Revenge, and on the XBONE all games will just be games (Fair enough, since there's no reason Gunslinger is less of a full fledged 360 game than the old King Kong retail game) but rather than making tailor made achievement amounts (possibly too much work and too many politics) they will all have 1000 total points, which means that Peggle 2 has the same amount of gamerscore in it as Assassin's Creed 4.
This means that score is absolutely meaningless. Why keep it? Is it just a legacy product? Do they think they are still selling games to cheevo hunters? It just seems weird and stupid. Even weirder and stupider when you consider that MS gave away Killer Instinct and even XBONE systems to people with high gamerscore. So the score is meaningless and debased but you can get real world items up to $500 in value for having a high one?
I feel like this is really dumb and Microsoft hasn't caught enough flack for it.