Ah, I remember that. That was brief lol. Never quite got our Sam/Bucky catchup.
Early on, I think Millar's Ultimates had a lot of the pandering problems the 616 has recently had, only with less cringey, forced millenial humour, and more cringey pop culture "modernizing". It found its footing and then lost it again in Ultimates 3 and Ultimatum. And it never recovered after that imo. There were undoubtedly some gems in that mess, but the 1610 did have an aura of expendability. You could live with the changes sometimes, since they weren't really "your characters". 616 is different in that regard. So I guess that impacts us differently.
I do wonder how the Ultimate U would've done Winter Soldier. Any ideas?