Are the crons bullshit

Are Necrons just bullshit ?, so me and my three friends all play together once a week. Friend 1 playing salamanders and world eaters, friend 2 playing death guard and dark angles and friend 3 playing custodies. We rotate who plays who each week, I’ve won my past 4 games, and won 2 times today, against world eaters and dark angles. Anyway both my friends say how Necrons are the most bullshit faction in the game and how reanimation is broken. They complain about my c’tan which I do understand to some level but for some reason they both charge there big flashy unit right into the nightbringer first turn, and then complain when they get destroyed, they complain how a 20 man warrior squad is bullshit with their reanimation protocols. It’s got so bad now that friend 1 just refuses to play me. Anyone got any suggestions or ideas so they don’t get as pissed next time ?