I think the car drop off charge is probably the one that irritates most. The other charges seem comparable with Heathrow and Gatwick.
I can understand the reason for charging for drop off given the congestion that could occur if it wasn't implemented. Trouble is many don't realise there is a charge until beyond the traffic lights which causes delays at the exit point and unless they've researched before travelling then they won't know.
I can't imagine many non-regulars actually seeing this sign because of concentrating on the unfamiliar road ahead, especially if there are several other signs nearby that contribute to sign blindness.