At first glance, they kinda seem like a game for little kids, but after checking out a few videos of both of them, they seemed pretty legit.

Microvolts, known as H.A.V.E. in Asia, is a TF2 styled(Not kidding, it's pretty heavy) game where you can equip yourself with 7 weapons, which is something you normally don't see in MMO shooters.
You can arm yourself with-
Melee weapons
Assault rifles
Shotguns
Miniguns
Sniper Rifles
Rocket Launchers
Grenade Launchers
And each weapon takes up each slot...
Better yet, here's a review on the game.
Brawl Busters seemed stupid at first, then I saw the fighting and whatnot.
I haven't played it, but I've got a strong feeling this could get repetitive.
Here's another review on it.Also, as I was typing this, I would go back in forth between the video.
You have to RENT weapons again, FFS, that gets annoying.
Another thing, the slogan of the game seems pretty...mediocre.
But someone tell me how the game is, so I don't end up downloading something I don't like.
I'm currently downloading Microvolts, and I'll be playing it tomorrow, for the download is 817 MBs, and I've only gone through 200.
In 2 hours.
EDIT-Not playing brawl busters, and microvolts wasn't exactly my piece of pie.
Might as well go back to Blockland.