I can't agree on the 3DS front. It's also no surprise support--and ambition--for 3DS is winding down, because the system is at the end of its life, but I thought the Direct was good and the upcoming line-up is still strong. A new Pikmin title, a new IP, another new Pokemon generation are the highlights for me. Link Between Worlds is far better than Phantom Hourglass and Spirit Tracks, Mario Kart 7 is one of the strongest entries in the series, we had a Smash Bros on 3DS, Awakening/Fates are superb, New Leaf is the best Animal Crossing and I think X/Y are stronger than any of the DS Pokemon games apart from Heart Gold/Soul Silver, which is a personal favourite for me. When you add accomplished, excellent titles like 3D Land, Luigi's Mansion 2 and Kid Icarus, you have first class titles that are ambitious for portable gaming. 3DS has a superb library of Nintendo games, with some weaker entries, as every Nintendo system does. It's not as if they struck gold with every DS title. I think there's some short term nostalgia going on here.
With Wii U, yes, there have been fewer ambitious titles and I agree they need to be more consistently ambitous with NX. Titles like Splatoon and Super Mario Maker are ambitious--not in a technical sense--but in a design sense, because they're unlike anything Nintendo have done before. And I don't think you can accuse Smash, Kart or Breath of the Wild of lacking ambition, nor a title like Xenoblade. But, and this is important, consider how badly Nintendo managed the transition to HD development and you have your first big reason for the lack of ambitious software: Nintendo were caught with their pants down. Then they had to throw more resources behind 3DS, which further delayed Wii U software, and then Wii U was a commercial failure, which meant with the exception of titles already in development and lower resource projects (like Splatoon or Mario Maker, which as I've said, were ambitious in some senses but not in terms of investment), there wasn't much sense in launching large scale, expensive projects that would take years to come to fruition.
Wii U is unprecedented territory for Nintendo, and so is this generation in general. That's why there's been a radical restructuring, and that's why whatever NX is, it will be different. Nintendo's business model for the last twenty years has fallen apart this generation. That pressure was always going to tell when it came to their software output, and Wii U is the most obvious and most necessary victim of that.
