Did any actors ever do a less than "stellar" job?

[ReadyAndWilling]

Beltran was terrible

 

[Sadara]

Has anyone else noticed how Marina Sirtis basically stopped playing Troi after Generations? Sure, she appeared as the character several more times, but she stopped doing Troi's accent and overall Troi seemed to become nothing but Marina in a Star Trek costume. I saw a clip of one of the Troi and Riker scenes from TaTV (sorry, I just don't have strong enough a stomach to sit through the whole thing) and it didn't seem like Marina was acting at all. Troi basically acted and sounded exactly like Marina. There was zero difference between the character and the actor.

I don't want to say she was mailing it in, but it sure looked like that's what she was doing.

I'm not sure. I would have to watch the movies again, but as someone who has seen Marina on stage at a convention, Troi would have to get a boatload more energetic and funny in order for her and Marina to be one and the same on screen. Troi is super ultra boring. Marina is not.