I don't mind personalised plates if they are good ones - I have to admit that two vehicles in this house have them, both gifts though.
I just can't stand the shite ones where they have to make a number look like a letter by changing it or spacing it illegally, or they change a letter by deliberately printing it wrong, both illegal and an MOT failure.
Some garages do get funny though, my missus' plate is her first name, spelt correctly with no altered letters or numbers and it passes the ANPR test with Plod and on it's 3rd MOT we took it to a different main dealer as it was closer to where we moved and the MOT tester got all funny as there's no double space in the middle.
Never had a problem before and we never took it there again, their loss.