She was controversial in that many people wanted Kirstie Alley to return and many people wanted the character gone after Wrath of Khan. In Khan, Saavik cried over the death of Spock and people felt that was not what Vulcans do.
It should be controversial. I rewatched all the original TOS movies this weekend and the three conclusions I have come to are:
1. TMP just absolutely sucks. V'Ger sucks and mid 90's Winamp gave better visuals than the 30 freaking minutes we watch the Enterprise cruse through V'Ger. TMP gave TNG its song and otherwise should be forgotten.
2. Robin Curtis just completely sucked as Saavik. They should have killed off the character, she ruined the third movie.
3. The Undiscovered Country's modernness feels like a good sendoff to that group, my only complaint is how un-Klingons the Klingons are.