Is the Trade Feedback exploitable?

Reliability does not prevent you from getting scammed.
Even if you -rep the guy, 1 hit is nothing compared to the 172 positives.
If you don't feel comfortable with the trade, don't go through with it.

You have a point but is the Trade Feedback exploitable? Is there any way someone can get red of a negative feedback?

Just to have an acount in SG, you need 100$ worth account. Who would create 100 accounts and spend money in them just to exploit the trade feedback? Yet nothing garantees you he's not going to scam you ;)
But +100 usually are trustable.

It's somewhat reliable. It's a good indicator of past behavior for the user, but it's no guarantee.

Also, make sure you're dealing with the right person by clicking the link on his profile page. So many times, people have made fake accounts using the same name & picture as a reputable trader, in order to scam others.

Make sure that you're trading with the right person, and not just an impersonator. It's very easy to just change your name and avatar on Steam to look like a known trader.

I don't see this offer in your trade post.
Did that person added you and made that offer in the Steam chat ? If yes, you might be dealing with an impersonator.

If the trade seems logical to you and person has a high +rep then yeah, it's reliable.

As you have none references yourself I would have asked you to go first as well. Only logical.

Everything matters, from the general image, profile, the game he/she offer for yours, negative reps here (even one negative rep can call a truth of the personality of a trader), steamrep.com. Also install EnchancedSteam addon for google chrome to help you indentify easier if its the original trader or impersonator and for some useful tools for everyday steam use.
As a new in trading its recommended to not trade for a game key, its always better and recommended to trade gift with gift or tf2/csgo keys, i never traded for a high value key because i can't prove if its used or not, the 99% of the high positive users are safe but shit happens sometimes like an unused key though for a game but in reality was used/traded/gifted by mistake.

• My opinion in trading :)

Visit the user's SG profile, from there go to his steam profile. If it is the same guy, he should be in your friends list and is not an impersonator. If the guy is legit, the risk is still on your side as you will have to go first unless you guys use the steam trade window.

I'm not sure what key you are being offered (tf2/cd go key, or game key?) but if the offer is legit...

Before I started trading for more expensive stuff, I traded mostly cheap ass bundle games. It helps to get to know SG trading business and you learn the tricks/ traps.

First thing to do is be ABSOLUTELY 100% SURE that the SG profile of the trader is indeed their profile. Click the button to view the user's Steam profile to make sure it is the same user (read the profile URL; Is it the same as the trader who made you the offer?).

If that has been taken care of, you are probably safe to trade.

If you have steamenhanced click on the steamgifts link in the user profile so you know for certain that it's who he claims.

Or check yourself by going to http://www.steamgifts.com/go/user/XXXXXXXXXXXXXXXX where the xs are the steam id not the name.