How good is my rifle?? Need opinions.

Go shoot the rifle. Run it hard and get it hot. I'm not suggesting you abuse it, there's nothing to be gained in doing that. Run it through a few drills and put it through its paces.

The two most common potential flaws you'll want to watch for is an early failure of the extractor spring and over gassing. But, until you go shoot the rifle, you won't know if it's good or bad.

So, get yourself a pile of 5.56 spec ammo and go shoot a couple of hundred rounds doing drills a couple of times a month. You'll improve your rifle skills and get to know your rifle. You'll know for yourself if your AR is a keeper or if you should get something else.

My prediction is that once you shoot your rifle and sort out any problems it might have, it'll be a keeper

+1 on what Mistwolf said, put a couple hundred rounds through it to check reliability- close inspection of the brass should give a pretty good idea of any impending trouble.
Looks to me like you've got the makings of an AR just as good as any factory direct impingement gun!
About the only reason I'd upgrade (assuming it runs OK), is if I found a deal on a piston upper or complete rifle, but that's just me. DI has worked pretty well for the Army for 50 years now.

The so called "piston" upper isn't an upgrade. It won't do anything a standard upper can't do. I'm not going to go into the details of why here because I don't wanna derail Dogbite's thread.

Agree with what's been said so far. Sounds like a good rifle; shoot it. If it's accurate and reliable, no worries.

Price does not directly translate into reliability. A lot of very expensive guns are unreliable and a lot of cheap guns are utterly reliable. Most of us have had cheap guns that were far more reliable than our expensive safe queens.

The minute you shoot almost any modern rifle it will lose the retail value you just paid for it, so I will suggest that you go with the others and keep the one you have to shoot.

I have Colt and BCM guns that are (so far) 100% reliable, and I also have an AR Stoner/ Anderson 7.62x39 hodgepodge gun that has never let me down, either. You just never know which guns will run and run sometimes...

If its properly assembled and functions correctly, its as "good" as you can shoot it.

Dogbite

As others have already suggested, you should put it through it's paces and see how it does. Only then can you make an informed decision based on your own experience as to whether or not you want to keep the rifle or sell it.

Jackal said exactly what I was going to tell you. Hype x price doesn't necessarily equal dependability or quality. My "cheap" factory built AR will run with the big names all day long and it cost me nearly half of what a colt would have at the time.