I'm a long time Diablo player & a big fan of the franchise (currently playing D3 as well), so I can put myself in the position of a prospect who would land on your salespage. For that matter, I believe my points might have merit in terms of understanding your clients, thus helping you do some needed changes (in my opinion) to your salespage and, ultimately, increase sales. So here goes.
The first thing I would like to point out is how exciting the music is for the video that automatically plays, but the disappointment that comes right after scrolling down to it. My disappointment comes from the fact that the quality of the video is very low, which in the realms of both casual and pro-gamers is considered taboo, and since you say "Created by Gamers", that kind of makes me think twice about the validity of that statement (as a customer). Also, the fighting cutscenes used look like they've been taken out from the beta.
Secondly, right after I scrolled back up to the header graphic to read what's in there, I noticed how the font style used in writing "Dominator. Exclusive Underground.. etc." seemed to be a bit out of context in comparison to the "Diablo III"'s quality of design and font used. I know I might have been very picky about this bit, but just my two cents
I later skimmed through the texts rather quickly and didn't read all of it, but in your benefit, I think the "Add To Cart" buttons are really awesome and the rest of the graphics are well done, though in certain parts maybe overused. However, I haven't seen you say anything much about the Inferno difficulty (actually I have searched for it and it came up only two times), which is the ultimate late-game experience that everyone aims at mastering and completing. Also, you haven't mentioned anything about Hardcore mode, which is also a main feat to make you experience Diablo at the "Pro" level.
Finally, the testimonials were obvious Fiverr gig (for me at least

) which is normally fine, but in the girl's video, she says "Diablo" in a wrong way, so you might want to consider a revision or buy another gig.
I have a good background on copywriting and salespages, so my only intention here is constructive criticism. In anyway, I wish you good luck with your sales
By the way, PVP is not yet implemented, yet you mention how you can "Never Shy Out Of Battle", so you might want to save that part until it's fully implemented.