The individual words may be comprehensible, but the sentence as a whole is very ambiguous and unclear. The most direct interpretation of it is contradictory, and beyond that it's pretty much nonsensical.

I don't think that anybody expects perfect English from people who may not have English as their first or primary language. That doesn't excuse sentences as broken and incomprehensible as the one in this case, however.

And it certainly is not "derogatory" in any way to point out writing that fails to convey whatever idea it was intended to. If anything, that's the best thing that can be done for the author. It's better for him or her to know that their writing has problems and cannot be understood properly, rather than not knowing this fact at all.

Did you really parse the sentence as "The service has nothing but its own advantages or disadvantages over ???other" with no need to backtrack?

I'm sure that if the author of that sentence doesn't master English yet, (s)he's pretty aware of it, and knowing that no matter what people can more or less understand really helps ensuring that (s)he will try again.