No, Apple has never acknowledged a problem. I've battled it on and off for a year and a half with an iPad2
I recently upgraded to the iPad4 (latest Retina with Lightning connector). Their literature touts improved WiFi capabilities. It worked flawlessly for a week, so I thought they'd fixed the issue!
Then it started acting up this past weekend. Suddently it could no longer load a website, despite showing full "bars" on the WiFi indicator. Sitting in the same location at the same time accessing the SAME website on my Google Nexus 7 tablet and my Android RAZR M phone I had NO problems.
When two Android devices work flawlessly ALL THE TIME and the Apple devices work 70% of the time, WHO has a problem?? If it wasn't for ONE killer app I use heavily, I'd dump Apple in a heartbeat. I will continue to lobby the developer to port to Android so I no longer have to put up with this crap.