Well, I've spent a fascinating half hour reading a few of these lists of the good, the bad and Cilla. After years of casual reading of DS, I've been enthused enough to sign up and offer my own list.
Up until fairly recently, I used to work as a radio sound engineer for Aunty. Mostly, R4, but some World Service, and a smattering of R3 and even some R2. I met a lot of presenters, announcers, and one or two guests, over the 4-and-a-bit years that I worked there. No one stands out as being particularly 'orrible, but, hmm, how shall we say? Some made me glad when they arrived, and others made me glad when they left.
Firstly, the continuity announcers, newsreaders and weatherpeople: absolutely top class folk, the lot of them. Not the slightest suggestion of a bad word to say about any of them. Some of them are completely potty, but they're all really, really lovely. Special mentions for Corrie Corfield (particularly naughty sense of humour), and Zeb Soanes (dreamily handsome, and really quite shy until he gets to know you).
No particular order:
Ed Stourton: can be quite reserved, but always pleasant.
James Naughtie: ditto, but not as reserved as Ed
Evan Davis: surprisingly shy, but a complete sweetheart
Martha Kearney: some people have said that she can be a bit remote, but she was always perfectly civil to me.
John Humphrys: abrupt and abrasive - but people tell me that he has got worse over the years.
Carolyn Quinn: lovely
Ritula Shah: Everyone likes Ritula!
Robert Peston: mad as a very mad mad thing. But in a good way.
Quentin Cooper: not an unpleasant chap, but not nearly as clever as he thinks he is.
Eddie Mair: if he likes you, he's your best mate. If he doesn't, he really won't talk to you much at all. But never a bad word to say about anyone (well, except for some of the people he interviews...)
Laurie Taylor: never really quite sure about him, to be honest.
Mariella Frostrup: goes out of her way to be nice
Sandi Toksvig: nice, but a little bit too fond of her own jokes. Very dry and satirical sense of humour, but it gets boring after a while.
Actually, one person stands out as particularly 'orrible:
Melvyn Bragg: pompous git
Other random slebs:
Frank Skinner: surprisingly normal. Expected to dislike him, but found him to be very personable and nice.
Bob Monkhouse: total gentleman, naturally witty, had an amazing ability to give you his full and undivided attention when you spoke.
Stephen Fry: two faced. That avuncular, charming, witty persona turns on and off with practised ease. Likes you for as long as you laugh at his wit and marvel at his erudition.
Aggers: side-splittingly funny, and a very good pianist (think he's a church organist too).
Brian Blessed: BRIAN BLESSED. Has enough personality for three normal-sized people. Love him to bits, but when he gets excited he is a bit of a sound engineer's nightmare.