Shinen took a disappointing turn with The Touryst, with its unimpressive blocky art style and often broken-feeling gameplay.

Mass Effect Andromeda and Destiny were huge steps down from their developers' 7th gen works.

AAA gaming in general felt very stagnant and bland in the 8th gen, mostly just rehashing 7th gen templates with shinier pixels.

Did you list the wrong titles, because lol... couldn't think of two worst examples. Both have releases that are arguably the best from the series, in their respective franchises.

On the top of my head for series.. Halo, Mass Effect and Tomb Raider (one could argue that this was dying 7th gen).

Onto devs.. Biggest fall from grace will be Bioware. From their excellent output from the 7th gen to floundering with Mass Effect Andromeda and Anthem. Crystal Dynamics as well with drop off with ROTR and beyond and Marvel's Avengers.

Bungie went from making THE Star Wars of gaming to making the star wars of gaming.

GOW 2018 was garbage and comparing Mario odyssey to Galaxy and sunshine that series has definitely fell off

Garbage, okay then. Not taking any recommendations from you anytime soon xD Odyssey is the best 3D Mario game, thus far. Sunshine sucks in comparison to most moderns 3D Mario's.

Gran Turismo, seems ridiculous that we'll be going this entire gen and the only GT game we'll get is meh Sport.

Halo, went from amazing Halo 4 to lackluster Halo 5 and now Infinite is delayed until the end of 2021.

Madden, has been on a downward spiral ever since they signed the exclusive deal, but the games this gen have been especially bad.

Battlefield, trying too hard to be a CoD killer instead of focusing on what makes it unique. Battlefield 4 was pretty good and just barely dipped its toes into the CoD waters. BF1 and V are doodoo imho.

To be fair, God of War 2018 is a very different game than the others in the franchise, I can see why some people may not like it, I wouldn’t say it’s garbage myself but I’d say God of war 1-3 was more enjoyable and fun for me(enjoyed the story, fixed cameras and settings better). Mario Odyssey was awesome though and I loved it but there is definitely an argument to be made for Galaxy1/2, those games are fire. 

Difference being you don't like a game =/= being garbage :P Just replying to hyperbole. Just like how I dislike 3D Zelda games (as opposed to 2D ones), but I won't call them crap games.

3 names of my list.

Gamefreak > Sword and Shield are the wrost pokemon games ever, hands down.

Bethesda > Once a mighty and great developer... still strong, but not so great now...

Bioware > Such great Developer last gen... now it's almost dead.

Bethesda's my big one. Fallout 4 was okay but a huge step down from New Vegas. 76.... Jesus H. Christ.

I'd say BioWare if I liked BioWare to begin with, but I don't.