No. For me, they rank alongside the 'zoom zoom' car advert, and people who don't seem to know that 'excuse me' means you want them to move out of your way.
If they scrapped the 1p's and 2p's they would be able to mint a decent sized 5p. OR why not make the 10p smaller and use metal from that? and 20p should be bigger too. - they could reduce 50p size for that, it's Huge. :-)
Especially irritating is the rounded edges of the damn things! You tried picking one up off a glass surface or shiny flat floor? Considering how long coins have been around I am amazed that the ergonomics are so bad for people without extending fingernails. Square edged coins give you a purchase for leverage but these things - sheesh!