My response applies to that as well.
Do you think the PT is shit? Do you think the room is shit? Do you think there is a single movie, book, song, or any other creative endeavor that can be assigned objective merit or lack therof?
If it is an art then objective merit can not be assigned to its content. There are some objective measures that can be applied to art in non-content-wise way, such as profit when it comes to selling the art where you can objectively say “this film was more successfully than that” based on the profit measure. But we are talking about content here.
So if one says “this film is bad” it is naturally a shorter version of “in my opinion, this film is bad.” or “I think this film is bad”.