Well, that was a short letter wasn't it?
Splatoon? Mario Maker?
Maybe it's just me, but even if Nintendo disappointed me a lot this year (especially Pokemon Picross instead of Z, only stability updates for both Wii U / 3DS, and Xenoblade censorship
) it wasn't a completely bad year, at least for me.
Well. I get your point, but they clearly not focused too much on the amiibos. On the contrary, I would say they have been really listening to feedback, as now (at least in Europe) every Amiibo is fairly simple to find (just the other day, I found a Rosalina, King Dedede, Meta Knight and Woolly Yoshi Amiibo in one store, and those were practically impossible to buy except online for more than ~70$ ) with the recent restocks, here in Europe at least. And actually, even if Nintendo focus "too much" on amiibos, you can't really blame them, since their objective is to make profit, and amiibos are really popular.
While I agree with you on that point (some games released this year were really not that good compared to their predecessors), those are not "Games made by Nintendo": they are games Nintendo only published, not developed, afaik. Mario Maker and Splatoon were totally awesome games. So why I still agree on the fact that some games were pretty bad, that was probably not influenced by Nintendo focusing too much on something.
When Amiibo came out, people were complaining about how they were not used in any games. One year later, people are complaining of the fact they are used everywhere.
Seriously, Amiibos' features are practically never that important on the games (except maybe the 2 new animal crossing games). And actually, I like this kind of thing; you buy an Amiibo because you like the character, and then you can use it for small bonuses in a lot of games.
Anyway, all the "big" extra content is available with DLCs, and my opinion depends on what game we're talking here. For Smash bros, for example, I think it's totally ridiculous; 5 euros (= 1 small indie game / medium game if in sale) for one character, 2 euros for miis costumes, etc etc. I think those are completely useless, and overpriced. However, on games like MK8, I really think the 8 euros asked for 2 DLCs that add ~50% of content to the game are definitely worth it.
Well, let's be honest here, there will ALWAYS be people complaining on anything Nintendo does, because people just like to whine about anything and everything. I think this image sums up the situation pretty well.