I play a few kits mainly due to favoritism on my part and those are also the kits that I'm actually competent with (I ain't no ME3MP genius virtuoso kthx) but I do not complain about any faction based on the kit I have. My main kit is the human vanilla female adept- and I use her with any faction with zero issues.
1- Cerberus: I like this faction bc all of my kills feel so satisfying. Throwing a phantom in singularity and shockwaving her to death feels good. Warping a bunch of dragoons and slapping them with shockwave also feels soooo good. It's just so good to kill them! 
2- Collectors: I like the way the abombs sound. I do hate the stupid OP bugged swarmer bug cloudy thing but I can deal. It is glitchy as hell but abomb sounds are fun!
3- Geth: if I have geth scanner equipped it is too fun to kill whole herds of hunters
But the stagger fest and OP Prime turrets and drone makes me irritated at times.
4- Reapers: everyone everyone selects this but the godforsaken BANSHEES. I'm tired of being a meat donut, man, what can I say. Imma meat donut way too often. I hate the Banshee scream so I tend to tune it out or lower volume or both- but then the Banshee can teleport right behind you and meat donut time it is. Banshee is the ONLY boss that regularly kills me. I freaking despise Banshees. 