IS this desktop worth the $570?

Those things were built to [not] last. So I don't know about the $570 tag.

I would either build your own or save up. That pc has some pretty bad specs. That cpu is outdated and we have moved on to the fx 4300 which is far faster. Though if you want an AMD cpu I would recommend the FX 6300 because it's an extra 2 cores for nearly the same price. For a graphics card I would recommend atleast a GTX 750 ti. My pc was only about $750 for all of the parts and the OS and it completely blows that pc out of the water.

I'm guessing you live in canada like me. The price very usa gets parts cheaper then canada like what kevin just showed you that 562$ would be 626.29$ to us but it actually would be even more. Because of shipping.

To answer if that computer is worth that much money. Ehh if its on sell or something I would buy it. But you can probable build a computer and get more out of it. To order parts from newegg make sure you use newegg.ca

Thats if you live in canada. I'm only guessing you do because you are looking at bestbuy.ca

Id say now you have 2 options. Either save up more to get a better one

OR

Build a PC
A 500 Dollar one could actually be a pretty decent gaming machine. If you are not such a tech enthusiast and can't build your own computers (which it looks like), try this video by Austin Evans

The specs on that $500 pre-build one destroys the one you saw for $570, so id say build it. Also GTA V might be coming on PC (most likely) so its good to have a future proof PC where you won't have to constantly upgrading the parts. Also as Austin said, "In this video I give a tutorial on how to build a gaming computer for $500 to play the latest next gen PC games like Battlefield 4, Watchdogs, Call of Duty: Ghosts and more!"

No, you're much better off building your own PC, not only is it cheaper, you'll know exactly what's going into your PC, and if anything ever goes wrong, you have the power to open it up and look around without voiding a warranty. As well as if anything goes wrong, You'll know the components, and how much each component costs.
It's much better to build your own, or even go down to your local PC shop and pick out the parts you want and they can build it for you! It's a much better deal, and it can be fun too.