Having lived in Bournemouth for 9 years now I would thoroughly recommend it. Property is very cheap providing that you don't want sea views.
We have great beaches and the countryside is magnificent (New Forest and Isle of Purbeck) Usually there is not too much traffic on the roads especially compared to anywhere in London. I know that it probably doesn't feel that way to people queuing on the M3 on Bank Holidays.
It's has got an undeserved reputation for being full of old people but it's simply not true. There are thousands of students at the university and it's a real party town. To be honest I could live with it being a bit more quiet!