I alerted this so CNET staff might get a look at this. In the meantime supply the exact Samsung model numers.
Sadly I think Smart TVs are a bit oversold. They are not that capable yet folk expect the same web performance as PCs, Wii's and more. The real story is something that is more along the lines you are reporting and why I advise folk to buy for picture quality and ignore the Smart TV apps and browser. Some Samsung folk do get upset at me over this but I'll take my lumps.
Do you know what an OLED TV is?
CNET explains how OLED technology differs from regular TVs, and what you need to know to make the right shopping decision.