Most of the popular tele-serials are not only illogical in their storyline(s) but also crude in their presentation(s)."
Please clarify whether it is okay to use 'storyline' and 'presentation' here though they refer to multiple storylines, or only a plural can follow 'their'.
"Most teleserials" is plural, so you are talking about multiple story lines and multiple presentations. I don't see how this sentence can be singular.
This confusion is easily avoided, and the sentence made more concise, with a simple rewrite:
Most teleserials have illogical storylines and crude presentations.
