as a previous artist (i still draw i just dont share it cuz i hate you all) i believe i have the right and ability to systematically go through this entire work and give a rather proper, fair, and opinionated rating; i'll also use proper grammar and stuff so that it's coherent
Line-work and Outlines: This is one of the first things for me to see in any artwork. Although Failureguy tends to draw with many lines and "detail," I don't find it very appealing in this case. Not only does the outline not match PB2's general style, but it seems a bit sloppy all around. The line widths differ in various parts of the skin, such as the actual outline itself and the little, 1px lines that accentuate the "detail" of the work. Also, some lines appear to be blurred, smoothed, smudged, and some just look rough in general. Most lines with separate colors surrounding them are rough, while the outlines are rather blurry themselves. On top of it all, the outlines are generally black; this cannot be helped considering the main color scheme to be grey, but I wish people used different color outlines. Not only would that help add depth to the armor, but it's what PB2 does - for the most part.
Coloring: The color scheme is bland. Albeit the visor is a bright yellow-ochre and the shield/sword/energy is red, the actual armor itself is nothing but a mesh of greys (and some whites). In my opinion, it comes off as dull to the eye, and it makes it difficult to differentiate parts of the armor separated from each other. Also, while not technically falling under a "color" critique, the filling of lines/spaces is somewhat botched. Although it's generally okay, it's clear in some spots that it wasn't done properly and/or to a fulfilling extent.
Style: It's becoming more and more "detailed" and sketchy in appearance. However, the many "details" don't really seem like details to me. The large number of lines and the differing widths looks a bit sloppy, in my opinion. In addition to that, there's the relatively-bland color scheme. I'm not tryna rag on this specifically, but a LOT of people nowadays stick with a rather dull, almost boring color scheme. I understand that greys, reds, and browns are typical colors of PB2, but it's even worse when it's not really done in that style; it doesn't match PB2's style. While PB2 is generally rounded and smooth (even in sharp-looking armor/weapons), this one is rather jagged and it has significantly thinner and more varied lines.
Concept: It's unique, but I find it to be rather odd. An elite unit of what? Why have a shield when his armor is 2 feet thick? Why have an energy tonfa rather than a sword/blade? The coloration doesn't help my understanding of it, but it's overall a decent concept. I don't have much to say about it, though.
General: It's ok. Truth be told, I've never been a fan of this style. I understand that not everyone can/wants to/should draw similarly or identically to PB2, however when it comes to PB2, the only reminiscent aspect of PB2 I see in this is the character shape/template. It's arguable that FG never had the intention of drawing in PB2's style nor ever will, but that's just my opinion. I don't think I'll ever really "like" the rugged, thin lines, but I do enjoy seeing people make unique fanart that's different from a typical real-gun-in-PB2-style or CS/beginner fanart.
TL;DR - not a fan, but its aight 6/10 (with 5 being a horribly "average/standard" fanart so 6 aint bad)
edit: some things