I've no strong feelings either way about HS2 but was rather won over to it this afternoon after reading this article where an engineer, rather than a politician makes the case for it.
http://www.theengineer.co.uk/rail-and-marine/in-depth/andrew-mcnaughton-tec...
"Much of the negative portrayal of HS2 has seen it depicted as an expensive way of taking relatively few people fast between London and Birmingham. But McNaughton insists that this isn’t the case at all. Instead, he says, it should be seen as a network with Birmingham at the hub, linking to cities in the north and the south, and enabling the upgrading of services on existing lines."