How timely. I just spent 2 hours re-installing grub2 after Windows wiped it out (I knew it was going to happen but I hoped it wouldn't be any trouble to restore it). As I use LVM, I had to copy the /dev/dm-* devices to /dev/mapper/<lv>-<vg> in order to install grub (this is what took 1h50mins to figure out). Then I had to boot in to Ubuntu and update the grub config again to pick up Windows.

That said, Ubuntu has improved a lot and despite the grub issue, I still love Ubuntu. I have converted both my parents to Ubuntu and I haven't had a support call from them since the switch.