People tend to remember Alien 3 - if only as the bleak one where Ripley died.
Problem is, whilst Fincher might hate it, and some Aliens fans might hate it, there are a lot of people who regard Alien3 as a masterpiece.
A heavily flawed one in my opinion, but still harder to ignore because of the obvious rift it causes in fandom, than any number of obviously poor sequels like T3, or Universal Soldier or Superman 3 and 4.