The thing is console games went to absolute shit at the same time too. Ignoring many great multiplat games and only using exclusives as examples, Castlevania SoTN became Castlevania Lord of Shadows. Turok became Turok (Reboot). Parasite Eve became The Third Birthday. There is a big difference in the complexity and required attention between these games. Everything. Every good franchise PC or console raped before my very eyes.
I've never attributed the decline as a "muh consoles" thing as many here seem to do, but rather industry-wide selling out. That line of thinking is false. The decline is just more noticeable on PC because there was more complexity that "needed" to be streamlined for mass consumption, as well as PC becoming an afterthought simply because consoles had a larger userbase.
Yeah, the 8/16/32 bit console and arcade era of gaming had plenty of great titles if you were into action games.
It's the 360 era of hyped graphics and sandbox games that brought the largest decline.
Rather than blaming consoles I would just blame graphics whoring.
The higher the amount of fidelity a game has, the more copies it has to sell to bring a return the publisher considers worthwhile. Which inevitably requires lowest common denominator type of design. Nowadays mainstream console gamers consider a game like dark souls ""hard"". But that's only because they never played games like Contra, Ninja Gaiden, early Castlevania, Mega Man, half of the shmup genre etc. Consoles didn't have the same sort of game as the PC, but they had their own core gamer genres they did pretty well. I can't imagine most modern gamers going through many NES era games.
The decline filled nu-Deus Ex series of games got cancelled because it didn't sell enough. Even with its decline stuff it still wasn't enough to make Squeenix happy.
Heck, squeenix isn't happy with FF15 and cancelled its planned dlc.. despite selling 9 million copies.
But this is what they expected from this game :
Final Fantasy 15 Needs to Sell 10 Million Copies to Break Even
Mind you, just 'breaking even' doesn't make publishers happy.
Back in the early 2k, BG2 was considered a "mainstream hit" for hitting 3 million copies sold. How have times changed. For any modern AAA game today, 3 million is an abysmal failure and if it is a game franchise it will stop receiving sequels at some point.
There's a decent amount of alright indie games and medium level/AA devs these days, so I don't give too much of a shit.