If you want examples of why its overpowered then i'd have to say its because of the sustainability of it. Saying "if you set it up wrong and light on fire and die 5 seconds later"... Lets be honest, if you're too retarded to see the molten bar filling up as you try it out then you deserve to die. The kenetic generator needs to be tweaked so it doesn't do that. Right now it is just all over the place. The pack has come a LONG way, so to anyone thats keeping up to date with the versions Vs using the released FTB pack versions i can see why someone might say its way OP vs other people like Lambert who doesnt know wtf you're talking about.
Lambert's on the RR test team and we, unlike FTB until quite recently, have properly configured MPS for months. And you may not be aware, but the trickiest part of current MPS is that the heat gain and loss rates are biome specific. Hot biomes like deserts and volcanoes (yes, BoP has volcano biomes) and (even worse) the Nether shoot up heat so alarmingly fast that it can take people used to bounding around without fear in normal/normal or normal/damp biomes off guard.
And we do notice it. It's just that we notice it in mid 120 block leap, land going "Oh no I'm lighting on fire!' in the middle of our fantastically cool-looking and hostile 1.5.* nether and realize if we move even one block we will go back on fire. "Oh here come the nitro creepers. Welp, lesson leaned! Active cooling is required!" Even then, I have to move carefully mining in the nether. And unless you're looking for Certus Quartz, you DO want to mine in the nether.
As an aside, you gotta be as smart as a whip to cop the kinda lame attitude you just copped. Even then, it's not cool. Play nice, kiddo.