There are like 5 different 2D-platformer series in the Mario universe and all of them play quite differently ( Yoshi´s Islands vs. NSMB vs. Wario Land vs. Donkey Kong )

There are 2 destinctly different RPG series.

Sport games, puzzle games, party games, 3D platformers with/without coop, Luigi´s Mansion, Captain Toad etc.

Saying in a roundabout and lazy way that all of them are mediocre is a terrible way to make a point .

Yep I know it's harsh but most of what he said is somehow true. I will never become a Nintendo Fanboy, but when you look at sport - everybody knows the only real Sport in the World is Hockey but as said before everybody knows that - you'll Never convince a Bruins Fan to become the biggest Hab around.
So actually i am a Xbox Fanboy ( i own a PS4 as well) and i am unable to become a Sony Fanboy.
To be a Fanboy is by the Way absolutely o.k. - i love People Talking Care of stuff, even they get Mad at Times.
We have already enough Fish following the rivers down.

What you said was ambiguous.  But the topic is about why you don't like Nintendo, and even though you gave us like 8 reasons, if you actually just mean Nintendo makes mario, zelda, and pokemon games and I don't like them then it's no wonder why this thread is so long....lol

Which btw, game freak makes pokemon and Nintendo has little control over them.  So really, your beef with Nintendo should just be between Mario and Zelda.  And to not like a company because they make 2 IP's that you don't like is silly.  It's like someone hating Sony or Microsoft because they made infamous and uncharted, or halo and gears of war.

Mushroom Kingdom needs a new hero.

http://www.metacritic.com/game/nintendo-64/the-legend-of-zelda-ocarina-of-time

http://www.metacritic.com/game/wii/super-mario-galaxy

http://www.gamerankings.com/n64/197771-the-legend-of-zelda-ocarina-of-time/

http://www.gamerankings.com/wii/915692-super-mario-galaxy/

http://www.gamerankings.com/wii/960551-super-mario-galaxy-2/index.html

http://www.metacritic.com/browse/games/score/metascore/all/all?sort=desc

http://www.gamerankings.com/browse.html

I still think Mushroom Kingdom needs a new hero. Something more realistic.

How does them having Mario in the game make the game mediocre?

It's funny to look at your sig and see this thread.

"Glorious God Gamers enjoy PLAYING the games. PC players enjoy WATCHING the games."

If you are part of the "Glorious God Gamers" race who enjoys playing videogames, I would expect you doing that. Instead I see you on this thread, complaining about a videogame company that you don't care about. What's it going to be deskpro? Are you a Glorious God Gamer? Because in my book you are more like the "Whiny Peasant Gamer" kind of guy.

Has the op ever clarified why they consider Zelda, Mario, and Pokemon 'mediocre', aside from just calling them rehashes without going into more detail?

What would they gain by ignoring the most iconic and videogame character in the history of the medium ?

Literally nothing. Their established IPs give them the chance to experiment with different playstyles in the boundaries of those IPs (look at the Kirby series).

And IF something doesn´t fit, they make new ones. Like Splatoon and Codename:Steam, both new IPs with new game mechanics announced not even 4 weeks ago.