Yeah, they definitely haven’t aged all that well. They were a product of their time for sure. This is why I’m interested to see what Hickman will do in creating a new Ultimate U which is also a product of its time, which is right now.
Remember that a lot of 616 stuff hasn’t aged well either, but because it was the one singular universe for so long it evolved over the decades. In the case of Ultimate, they get the chance to do it over again 20 years later. And that could be highly interesting, so long as it is indeed updated versions of the classic characters and not totally new and unrecognizable versions. If it goes the latter route, it will feel like X-men 2099 or something where I could care less.