Days Gone was one of the few AAA Sony exclusives that didn't get critical acclaim, but you can't argue the quality of Sony's exclusives this gen. What I'm trying to say is that both companies have roughly the same number of studios but their focus is completely different. Just look at this year. It's basically TLOU2, Ghost of Tsushima, Dreams, FF7, Nioh 2, Death Stranding etc. vs a bunch of filler titles for GP and Halo. Some of those AA games will probably turn out great and get good reviews. But how many people, who bought a Xbox to play Halo or Gears, would honestly get super excited and buy a game like Ori? Sure, it's a quality game, but it barely sold 1.5m copies.
Now, if people can play Ori for free through GP, I'm sure many will give it a go, just like I did. My point, however, is that MS doesn't seem to be focusing on games that core gamers would pay full price for and instead are going for quantity to fill up GP. I mean Gears Tactics looks pretty cool, but would you buy it for full retail price?
MS is releasing more than "Game pass filler." The majority are high quality titles that have been in development for years. It started out this generation with MS not releasing enough games, but now that games are coming, they are "Filler." Should we ignore games like Dreams and Death stranding because they don't appeal to the vast majority? TLOU2 might be delayed to next year which is easily Sony's biggest title this generation.
The best part about Gamepass is how gamers are trying games they wouldn't have ever before. It lets MS release great games regardless of genre. I would rather see that than MS only focusing on games they know will push sales. That was MS biggest issue this generation and the end of last gen imo. Btw, MS core games isn't the same as Sony's. Age of Empires, Minecraft, Flight Sim, Halo, Gears, Forza all show a wide diversity of games, and all are big sellers. Gears Tactics and Minecraft Dungeons could become extremely popular especially on the PC side of things.