Hi mua2Ali,
While generally AWA is not a main input in determining admissions, your 3.0 is a bit worrisome. Depending on the competitiveness of the universities you are looking at, it could be a red flag. Anything within the top-30-40 will likely cause you trouble here. While we don't normally suggest retaking solely for AWA, if you are indeed targeting more competitive schools, it may be a good use of your time to do just that. While I am not an expert on the GMAT - typically candidates answer each question with more than just a paragraph, even if it is well-written.
Best of luck,
Daniel Richards
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