No! I don't believe anybody can truly form an opinion on any sex toy with one use. For me, it will take at least 5 uses and for something besides an ol' cheapie, I'll wait weeks sometimes months because I want to provide as accurate as a review as possible and I've had many toys that truly take months to know. For me, it totally depends on what day of the month it is when it comes to my reaction to a toy. I recently bought Icicles no.7 and the day I got it, I used it and hated it, but knew better than to trust myself because I knew I would need more than a few experiences. During certain days of the month, anything inside me will be denied. Lol. I suffer from endometriosis so I have to be really careful. Sometimes one in and out motion will cause me serious pain and can even last all night. When I use a toy and no matter what we do, it's uncomfortable, I always wait until one of my "horny days." Lol. Usually, I end up loving the toy I hated. Now if it's an all around shitty vibrator (sorry! for the language! lol) I will probably keep somewhat the same opinion about the vibrations. It don't matter what day it is, if it's buzzy and numbs me, it's going to do it no matter how horny I am. Lol. I'll never write a review with only one use though!
For instance, I bought the Enchanted Crystal vibe and adored it! Used it internally and had some pretty amazing O's. Very surprising too and I knew I would give it a great review (besides that it's a crappy massager) and the 2nd use, it BROKE! So that completely turned my opinion around. I don't trust any sex toy review that was written soley on one use.