While I don't have very strong opinions about this change, my experience mirrors the above. The damage increase didn't seem noteworthy to me, and the changes to vulnerability were hard for me to appreciate in detail.
I'm not a hardcore Sentinel player, I only have one and it uses a lot of procs. So in full disclosure it's hard for me to know where the baseline was for damage, but so far this doesn't provide impetus for me to leave my Fort, Scrapper, Stalkers, or Brutes.
I do sympathize deeply with both Sentinel lovers and the developers who are trying to move this AT from the laughing stock to something that is acceptable by the community. This is a hard thing to get right.