Just unlocked the Krogan soldier and saw all his bonuses for melee so I just had to try it out. Once I got the hang of it I was tearing though Reapers like a hot knife through butter. Watching Cannibals go flying was hilarious. I gave him a Scimitar with a blade attachment, but the only point was the blade, never even fired the gun.I actually made it through 5 waves (bronze) before failing the 6th wave because it was a device objective. Actually, I just blew that off and ran around for 5 minutes just smashing everything in sight. Who'd of thunk heavy melee was the best way to take down a Ravager?

I have named him Mini-Grunt. Brutes, not so much, though I did take down one with heavy melee after getting it down on health with a combination of incendiary grenade and carnage. Despite this, I would not have thought it advisable to attempt to melee a Banshee. But I just played an bronze match and watched a Krogan player actually go mano-a-mano with a Banshee and not die. (Course, he had a lot of help.)
Have people put together all Krogan teams with he objective and taking everyone down with just melee? (Wrex's Army)
Still, playing on xbox, the issue of having to take your thumb off the camera control in order to melee showed up as an issue. BW really needs to work on their key mapping so that controls that would benefit from steering while using them do not require taking your thumb off the camera stick, specifically running and melee.