I have mixed feelings.It depends on the person and the context.If it were me being sacked then an email would be fine -I wouldn't care about the method but about being sacked? yes possibly- but there are people and times when you just have to grit your teeth.When, years ago, the drummer and I decided to get rid of the other guitarist, we called and said we need to talk. When we got to his house he'd misunderstood and got all his gear out for a rehearsal and his clinging hero-worshipping wife had put out cakes and made a nice pot of tea and we felt awful and as nicely and as matter of factly ( is factly a word?- who cares?) we did the deed. It was very upsetting for us all as we liked him but there was no getting away with it, he wasn't suitable and we had made a mistake when we'd auditioned him ( he could play three or four songs really well but after that, nothing).
Anyway, Mr Bump, I hope your band goes on from strength to strength and that your "ex" finds another band.
It is funny- my own band had a change of line up and dynamic at the beginning of the year and the new guys are pretty good and there are grumblings about the rhythm section ( both good mates of mine and original members) and talk of a possible side project with me and the two new guys. That'll be interesting!