This could have gone in the "Grumpy Old Men" category, but maybe worth their own thread, because they are so bad! What I notice these days is that they (the referees) are good at the "presentation" aspects, that is all the hand gestures, the running backwards while keeping an eye on players, etc., but they are p*ss poor at actually observing infringements, such as defenders wrapping their arms around opponents in the box before a corner even gets taken, or blatant shirt tugging that the entire stadium sees.
And don't get me started about linesmen. This must be the cushiest job around. Apart from sticking up their flag randomly when there might be a hint of offside, none of them will decide which way a throw-in should go; without fail, they wait until the referee makes the decision and then they put the flag up to confirm it. Total non-entities.