The reason people dump on HS2 is that it's a fantastically expensive way of doing exactly what we can already do, which is take a high speed train from Birmingham to London or vice versa.
If it was perhaps, Exeter <-> Bristol <-> Birmingham <-> Sheffield <-> Newcastle , or some other new route that wasn't well served (i.e. NOT a London route), and had the potential to open up new commuter routes and investment in less well-served areas, I'd be able to get behind it.
Think we're getting the east/west line through my old town, albeit it's going on what was the old railway previously. They've torn up a lot of old 'Wildland' either side of the old track.