An unlikable person committing unlawful acts unrepentantly doesn’t sound like a winning premise for a movie. Especially not if it’s a drama starring Melissa McCarthy in bad hair and worse makeup. And yet “Can You Ever Forgive Me?” works. And I mean it works on multiple levels. Forging letters by famous people? Instead of not caring, the obscurity became fascinating. McCarthy playing the aseptic Lee Israel? Instead of rolling my eyes, I couldn’t remove them from her car wreck of a life. Added bonuses: a couple of solid supporting characters, just a touch of Manhattan scenery and subtle, jazzy soundtrack.