I have both good and bad experience with AliExpress. To be specific, I have both good and bad experience with the Sellers. If I have googled how to spot fake or bad sellers/advertisements, and have read the fine points hidden somewhere in the seller's page, I probably would have avoided that bad experience. I found that the AliExpress Dispute Judgement Team is sided with the Seller (in my case, HeZong Households Store). HeZong shipped me the product that is significantly shorter than the pictures in the ad. I have uploaded all the evidence (ie, pic of the product, transaction screenshot, free shipping screenshot, etc.) And the Judgment Team said my evidence is invalid. My dispute was rejected because I should upload a video of how the product is a defect. I have to create a video to show them that the product is shorter than the seller's advertisement. How am I going to do that?!? HeZong has blatantly misrepresented a product and play "you didn't read the fine print" card. AliExpress is protecting bad sellers like HeZong because they make money from seller's fee. I am not sure whether it's AliExpress or HeZong, my buyer's feedback (with pic of the actual product!) is not displayed on the ad page. That means HeZong can continue to 'lie and trick' buyers with nice photos.
The good sellers sell products that are like the pictures in their ads. If you are willing to pay extra shipping fee (you can select), the products are usually delivered on time. If you like "Free Shipping", then be warned, it might take 2-4 months to get your order.