Hi! Thanks for sharing your experience. Unfortunately I had the same negative experience. I spent an hour or two trying to upgrade to Angular4/webpack2, but I ran into problems. This was in April/May I think.
I feel that AngularJS and Webpack2 still are a bit immature and poorly documented. For me the upgrade was not important, so I dropped it. I will probably try again sometime later. If I succeed I will post it here and/or update the Github repo.
Please let me know if you do manage to upgrade!