Assaults in order of awesomeness
James5955 beware. He makes almost everyone else in all the categories look like small children. He was so ridiculously good he made most of these players look mediocre or even bad. He's the guy that gets spawned on the enemy spawn and 2 full proto squads get Rick rolled and then would would proceed to average 25-0 in a full squad of imperfects, in ambush, without an OB, often.. Hope he comes back.
Regnyum
Znigflo72
Fizzycandy
Xprotoman23
Sir Knight
God nova
Grimmiers
Djinn kujo
Markof22
13ear
Annie Oakley
Calamity Jayne
K-con
Djinn hellsreaper
Lordchaosqc
Everyone else In no particular order:
Hiro Liberty
Baracka Flocka
The Dark Cloud
Nikia Bethune
Pipies
Djinn soul
The Spinner
Revoltz
zBroadway
Piercing Serenity
Steagle
King Kobrah
King Babar
Twisted202
Xerothebigboss
Honestly there's like at least 5 imp assaults that are as good as a few of the beasts on this list. Like Doug ugly.
Haven't seen them play enough but on reputation alone mojoe and his little brother would prolly round out the top 20.
With a lot of plausible notable honorable mentions.

Heavies:
Sponglyboy squardoo is a monster.
Chicagocubs4ever
CSRsample
Foxhound elite I think is the beast in seraphim that always beats me unless I seriously get the drop on him.
Whataguyttu
Massive nine
Sprayandpray2
Lecuch (not sure now)
(Now) chaotic crusader
Hightimes
Ragehart
Imp heavies.
Marauder was pretty solid
I'm missing some

Scouts
Radar makes it look easy. He just has to watch for re's unless he sticks with the noob tube flaylocks. ;)
Ellithana Mori not well known but a beastly scout
Sha is high profile and I've played him like 30 times in pc so I'm a little biased but I think he uses the noob tube flaylock pretty well.
Reflex last build was ridiculous. Now he's a sniper so I would put him in his own class.

Logi's difficult. Cause I know of not many really true logi's. just assaults who are good at spreadsheets and went logi.
PT SD easily tops my book. He was the greatest logi I ever saw, and he did it in a militia suit or a sever. He would go 15-2 in a sever with a militia assault rifle blueprint, not even his exile, just to screw with proto players back in march. Beast mode logi.
Copyleft
Fiddlestahp


Snipers
Gem cutter
Lhughes
Tien
Radar back in the day
Sleepy Zan

Tankers
So many but honestly slap26 was probably the best.
Imps got like 5 awesome tankers
Hotchkiss
Attorney general
Lecuch and sprayandpray2 tore it up in chromosome
Mavado is a beast
Thelegend345
I'm really pulling some blanks here. Lol

Alldin pretty much destroys in any class he decides to play.
Example has destroyed as a heavy, logi shotty, and tanker.

I'm probably missing out on so many beasts honestly I just named all these guys off the top of my head half drunk while playing slot machines.

Im higher on the list so i guess that makes me better than you? :)

WTF? This is why your aiming is messed up.

I tried the combo before and its pretty good.

Its easier to strafe with the controller, and easier to aim with the mouse (Well, it was easier)

Its hard to get used to though.