There's a reason I mentioned critical and commercial success, because the two combined are the closest we can get to an objective measure of quality. If the game is selling well and reviewing well, it's very difficult to make an argument besides your own personal taste that the quality has declined.

I havent owned a console so that explains why I don’t recognise Naughty Dog.

There's never been a better time to play video games and not own a console, because there's hardly such a thing as a console exclusive anymore, but you'd really have to live under a rock to be unaware of Naughty Dog if you've ever paid attention to E3/summer announcements, game of the year awards, or just what other people are saying on forums.

I have played quite a few fighting games and the genre is definitely quite stale when it comes to single player. The only ones I can think of where I enjoyed the single player was the new Smash and Skullgirls. Mortal Kombat hasn’t had a new idea in like decades, they seem to be content with milking the franchise without doing anything new.

This is a very strange paragraph. NRS are the fighting game studio for single player content, and they were even during the 6th gen era when people generally didn't like Mortal Kombat games. If you think they haven't had a new idea in decades, you definitely haven't been paying attention for at least one of those decades...the past ten years. The most recent game added kameo fighters, which shook up the way those games play quite a lot, plus up blocking and a way to convert down 2 into air combos if you've got the meter for it.