John G. answered 08/03/19
Specialist in Research Projects, Story Continuity
It is definitely harder to write an unlikable POV, but that doesn't always need to be the case - see Game of Thrones characters Theon Greyjoy in A Clash of Kings, Jaime Lannister in A Storm of Swords, and Cersei Lannister in A Feast for Crows.
Of course, POV characters tend to become more likable simply because we get to see all their thoughts and feelings and end up understanding their motivations - after all, even a villain has good reasons for their actions, so long as they're well-written. And don't worry about the story not being "interesting" if the reader doesn't like the POV; rooting *against* a character can be just as intriguing as rooting *for* them.