These problems started for me with 8.0.2 on my iPad 3. Things were fine with the first 8 (and I skipped .0.1).
On top of websites not loading all the way maybe 20% of the time, across all browsers
I get a lot of "invalid certificate for this server" type messages on all browsers, and consequent "this website might not be safe!" warnings for regular sites like IMDb, or this site, or Vox.
At first I thought this might be a bug with the new version of Coast (my regular browser), but I quickly saw that it was happening in Safari, too.
So basically, iOS/something keeps seeming to think that many servers are using unsigned certificates and they're not safe or could be fraudulent(??).
AND -- this is keeping my from being able to use any YouTube apps, the official one or third party, or any of Google's apps.
The official YouTube app will not load anything at all when it's opened. I deleted the app and installed it again, and now it sticks at the "Sign in to YouTube" screen with nowhere to go.
The official Google search app tells me to please check my network connection.
And most telling, MxTube, a third party YouTube app I've tried, gives the message at start up: "The certificate for this server is invalid. You might be connecting to a server that is pretending to be 'data.youtube.com' which could your confidential information at risk." And I can't move on from there.
This app has no problems loading its banner ads.
Sooor, basically I can no longer depend on my iPad to load a webpage entirely, or to not give a false error message in the process. Or it is completely not functional when it comes to my most oft-used YouTube and Google Search apps, and whatever else I am yet to discover.
All other internet connected devices work just fine. YouTube and all load just fine on my iPhone 6 with 8.0.2.