I'm just going to address these one at a time...
"Not putting out the best product that they can" -
Nintendo produces excellent products. In the last decade in a main title game like Mario, Zelda, Pokemon or anything that is relatively under appreciated such as Pikmin, Tomadachi life or even the new Captian Toad these games are from a design and quality perspective flawless. Each delivers hours upon hours of engaging gameplay. Only on rare occasions have I heard of any gamebreaking glitches that exist in the games and those recently have been patched in a matter of days. (See the Lumiose City save glitch from Pokemon X and Y and how it was patched in less than 72 hours) If you are referring to graphics they actually played it smart. if you look at the new TVs that are coming out now and some of the games that are played on them they are incredible. We have actually technologically surpassed that resolution that the human eye is capable of seeing. What this means is that making bigger and better graphics is reaching a wall of impossibility. After another generation or two we will have reached the peak graphical capabilities that we as humans are able to process. However even with the lower graphical capabilities of every Nintendo console when compared to the other consoles of its generation, Nintendo games often look better. They rely on the aesthetic, the way the game looks. This is why we can play the old Windwaker for gamecube (2003) without complaint because it still looks good in its style, where on the other hand Max Payne 2 (also 2003) looks horrible with its clunky old graphics. If you are talking about the hardware quality then bear in mind how difficult it is to break their things. The 3DS wasn't allowed to be released until it was proven that it could consistently be dropped from a height of 5 feet onto a concrete floor.
"They screw over 3rd party developers and make their consoles super weak" -
As stated above Nintendo doesn't make weak consoles. They don't push the limits of their consoles and prefer to make cheaper consoles. (Wii U currently sells for 300 at the most and as little as 200 whereas the Xbox One and PS4 don't come under 350 and up to 600) Yes their third party support is not good and even worse for the Wii U but that is the purpose. Nintendo doesn't support itself on 3rd party games like the others. If all 3rd party games were yanked from the three systems the Wii U is the only one that wouldn't crash and burn. Nintendo in its desire to experiment and reach out for new styles of gaming (see the success of the Wii if you need proof that's a good strategy) Lets be honest Nintendo's systems don't lend themselves to 3rd party developers very well just due to system setup. Nintendo loses a lot of money on failed 3rd party games and weeding them out makes good economical sense.
"If they do get a 3rd party game then it will have sections missing or only have half of the game or be a gimped version" -
Like I said. Often 3rd party developers can't change certain aspects of their game to work with Nintendo consoles or controllers. The Wiimote is pretty unorthodox and hard to design around especially if you are trying to release on multiple consoles. However you just need to look at the sucess of the Wii to know that isn't an issue for Nintendo and isn't making them any less relevant.
"They love to copyright youtube content that mentions their games. That is bad for business" -
Actually YouTube loves to take down content. They have a system of "Content ID matches" which automatically flags a video as being copyrighted and their software removes it. Nintendo has worked with many larger channels of their own accord and smaller channels that reach out to them through mediums such as email and twitter to get their channels whitelisted on YouTube and prevent their videos from being removed.
"When you are in last place and don't adapt then you are like Nintendo" -
I'm not exactly sure what you are trying to say here... If you are saying that Nintendo doesn't adapt to their issues i would argue that you are mistaken. Honestly they often innovate in a direction opposing the issues and shortcomings of their previous consoles.
"I love Mario and Zelda games to death but they can't pump those out to support a console without limiting the experience that you could have or having only a few games." -
Actually Nintendo can and will continue to support itself on its main series. Of the top 50 best selling games for Wii 34 were made by Nintendo and all of the top 15 were Nintendo made as well. For the Nindendo DS only 2 of the top 40 best selling games were non-Nintendo made both consoles outsold their competition Wii selling 100 million units VS the 80 million sold by Xbox 360 and PS3. The DS has sold 150 million units since its release and the 3DS is over the 100 million mark. If every PSP and PS Vita unit is counted together it hasn't surpassed either one alone sitting on only 70 million units.
"They need to drop the Wii and Wii U label because it just sounds stupid and go for the Super Nintendo II or Ultra Nintendo or something like that." -
This one is nothing but pure opinion. The name of the console really has nothing at all to do with sales of the unit (see above)
Nintendo is doing just fine for itself. It isn't in last place. Economically they are actually in first. And in my opinion it will continue to do so. The Wii U was a flop at launch but it is slowly picking up the slack. It won't ruin the company, They will continue to support it. And come the next console Nintendo will continue to advance and to innovate its way into yet another generation ahead of the pack.