You might also want to take a look at pricegrabber.com or techbargains.com, since you can compare side-by-side buyer ratings on specific items. If you know what it is you want to buy, you can find a good source for it there.
I'd suggest taking some of the posts on sites like resellerratings.com with a grain of salt. Just like with Tripadviser.com, in many cases, the only people who complain are those who have a problem with something. And very often it's because that person did something wrong, or had expectations that weren't met, and not because the seller or supplier was doing something wrong. How many thousands of online orders take place every day with no problem at all? The buyer is totally happy, but it never gets reported.
Buying online is a slippery arena, and you should be cautious about where you spend your money. But don't hang everything on the results posted on one site. Check several sites, at minimum, and then buy from a name you trust. If you've never heard of them, there may be a reason for that.
Case in point (since I mentioned them earlier) is the Costco.com review at resellerratings.com. There are 49 reviews there posted in the last six months, compared with how many tens of thousands of orders placed? Unknown numbers, but it seems skewed in favor of complaints, and nothing is said about all the invisible-but-satisfied customers.
There are several misleading and erroneous reports there. People reported being "on hold for half and hour" or such. Truth: If you call their Customer Service line and they're all busy with other customers, you have the option to leave your number and they will CALL YOU BACK when they're free. No waiting on hold required. But the complainer didn't mention that. It goes on, but it shows that the complainer doesn't always give all the facts.
Another issue: Shipping to the wrong address ONLY happens when the buyer puts in the wrong address, or hasn't updated their membership address when they last moved. The shipping label is taken directly from the buyer's own data, based on the membership record, or the shipping address entered by the buyer. So it isn't Costco's fault if the buyer made an error, but they're being blamed for it.
I buy from Costco.com regularly, and I've never had a problem with an order. But I'm cautious about what I'm buying, to make sure it's what I want. And if I receive the item and decide I don't want it, I can return it in person to my local warehouse, and not only receive immediate credit for the purchase, but I also get back the shipping charges and sales taxes. Many online dealers won't do that, and may even charge you a restocking fee, if they'll even accept the item for return.
The biggest reason I like buying electronics from Costco, whether in the warehouse or online, is because they will take it back, no questions asked, for 90 days from date of purchase, regardless of the reason for the return. I don't know of any other company with such a generous return policy.
I hope you find the TV you want at a great price, and that everything goes smoothly. It's always a bit tricky buying online. As I said before: Good luck!
Dave