Yea, MOO had a diplomatic victory that wasn't too hard to achieve after (or even somewhat before) the tipping point. MOO2 also had a diplomatic victory, and I don't think it was much harder to get to.
Where I ran into bogdown in MOO2 was during the war phase when I wanted to get the most out of my ships but retrofitting took a lot of UI interaction, and in general interacting with every ship individually in a number of contexts was time consuming. Adding a new colony or getting a new building through tech could also take a lot more UI time than seemed appropriate.
With MOO it wasn't as bad, though I recall having to take longer than I liked doing "for each planet, do X" actions during production changes, utilizing new tech, etc.