There are loads of annoying characters, and quite a lot of them far too prominent, but some great ones too. I like Jazzer, Jolene (and usually Kenton), Alan and Usha, Phoebe, Emma and Ed, Will, Clarrie, Adam and Ian, Alistair recently (didn't like him during the gambling period), Elizabeth, Lynda and Robert, Fallon ...
Also I like quite a lot of characters who rarely appear now: Debbie, Nic, Oliver and Caroline.
And there's plenty of others whom I find bearable: Jenny, Shula, Johnny, Freddie and Lily, Jill, Peggy, Rex, Bert, Roy.
I think the problem really (from my pov) is just like the unlikeable characters are given too much airtime relative to the likeable ones. There's enough good ones to outweigh the nasties but they don't get enough stories.