I just had the experience of watching a friend of mine post a request from her more computer savvy friends to see if she was getting a decent deal on a computer. She posted a link to the computer. She mentioned that she wanted to do a bit of gaming, and didn't want to switch to a Mac, but would prefer to stick with a PC. However, the computer would be primarily for work. Simple enough, right?
Here's some appropriate responses:
1) Looks good for what you need it for. Get it.
2) Looks good for what you need it for, but I've found a better deal, and here it is.
3) This specific thing that you mentioned is going to run into trouble because of this other thing I've noticed about the specs on the machine you linked. (This isn't the case, because for her needs, the computer she linked was fine. In fact, it was more than fine.)
4) That particular computer/brand/store/warranty has given me trouble in the past.
Guess what responses never got posted? ANY of those. The first comment was a rant about how owning a Mac sucks. Then it went into how if you're going to be playing games, your machine can overheat, so go ahead and buy a fan to cool the thing. Then there was this thing about getting a Solid State Drive and switching out the drive that comes with the computer, because it'll enhance the performance of all the things you need it to do. It can take the boot time from 1 minute down to 25 seconds! WHOO!
Here's the thing. If you can't be of the help that the person asked for, shut up. She didn't want the dissertations on things that don't matter to her. She wanted to know if she was making a huge mistake by purchasing a computer, for her needs, all of which are pretty basic. Unless she's about to head in for disaster, OR you've found a better price, a simple "For what you need, that looks good" is more than enough.
This is why nobody wants to talk to the technically inclined.