This is the build I use. he is my main melee character:
http://kalence.drupa...23N56362!G.FE8L
Keep in mind you get to remove (glitch) the weight off these mods on this weapon and your BC cooldown goes to 4.44 seconds
As Loufi / Qy mentioned, use a combination of different level (ie slopes, stairs etc.) to avoid synch kills until you learn the animations of the various synch kill units
Edit: Kroguard actually makes pretty good use of power efficiency modules also .. although with a high level cyclonic he is unkillable except for synchs
Similar to the build I have, with a few minor differences. Btw, how does the weight glitch works again?
Cooldowns are overrated (we're usually talking about a difference of a second or less), and the Acolyte is a niche weapon (i.e. worthless against armor, which all bosses have). But that's beside the point anyways. Self-respecting Krogan don't use silly little ping-pong ball launchers, they use real guns- do yourself a favor and throw the Claymore or Graal on him. Besides, Kroguard is all about melee and there's no Omniblade for pistols.
My Claymore is I... I can try and see how that goes. Also, at least in SP, I always like the Wraith more than the Claymore since it's more forgiving (2 shot clip vs 1).
However I do not own a Wraith yet, so Claymore would be all I have. But it's true that I seldom have to shoot with the kroguard. It's charge/melee most of the times, and constant raging 
I'll have you know that pretty much all of my asari(save for justicar... she always was the odd one) like their shotties. The adept, vanguard and huntress are ready for one mean cat fight when there's Claymore on the line. Three babes and only so much of the High Lord to go around... there were casualties even.
Among the onlookers suffering heart attack from too much sexyiness, but still!
Valkyrie is a simple gal, but try to take her Raider away and she'll annihilate you.
That tech armor looks so damn weird on the Valkyrie. It would be cool to duel in this game, and although balance would certainly come into place, it all comes down to skill anyway.
Asari with toy weapons are ok, bigger characters can be weird with small weapons. I once equipped an Executioner on my Jugg. That was odd...