EDIT: Extra stuff edited off after merge. I searched for this thread before posting, I really did. >_>
And now some of my opinions:
TLDR: Onslaught is not an epic. It is epic win.
The most recent (as of writing) entry into the Wii FPS market, Onslaught could be considered an ambitious game for wanting to deliver what most consider a "core" experience via WiiWare, a distribution channel that serves relatively small projects. While it certainly can't measure up to the likes of Call of Duty 3 or even Far Cry: Vengeance, this is because it does not set out to be like other FPS games.
With its cheesy point-scoring, plentiful ammo, even more plentiful targets, and quickly digestible levels, Onslaught provides an experience that can be better likened to a fun and addictive catchy light gun arcade game. The kind that eats dollars, not quarters, and has you either coming back for more or staring at it wistfully; thankfully, it only costs a pocketful of Wii Points, and from then on it's free play, baby.
Holding a toy gun and sweeping it recklessly across a horde of aliens is a guilty pleasure few players may have revisited since before hitting puberty, and it's a most welcome sensation with the precision and speed built into the Wiimote. And the best part is, you don't feel like an idiot; the game doesn't take itself seriously, why should you? It even goes so far as to cover you in blood with each gritty close-up kill, to the point you have to manually wipe it off yourself; that's not a graphical gimmick on your visor there, buddy, that is the sweet smell of unbridled carnage. It's not enough the six-digit tally and cheesy voice-overs tell you you're doing a good job: you will literally go blind from bloodlust. Getting lost in that feeling of continuous slaughter and gunfire, with no bull**** pauses for action events or healing, is truly wonderful.
The fact there is no jumping or crouching says a lot about what Onslaught is. The environments are large, relatively featureless, flat, and dull. Is this a bad thing? Heck no. This is FPS: First Person Shooter. There is only one thing you need to do in this game, and that's point the gun and pull the trigger—okay, make that two things—and it gets at the essence of what makes a bullet junkie froth at the mouth, without any of the gimmicky cover and stealth mechanics, nor squad-based combat: it's old-school run-and-gun gaming with a next-gen controller, and it feels great.
Focusing on just you, the bugs, and plenty of bullets in between—just like those days when you held an empty water gun, or your unplugged Light Zapper, and stalked invisible aliens through your backyard—Onslaught becomes a truly immersive experience.
"That's why you're still a kid!"