Just judging the change in our pull-list, I would definitely say this is true. Pre-DC Rebirth our list was about 80% Marvel, the rest various Image titles and Batman. Now it's a complete 180. I think our only Marvel titles are Darth Vader, Doctor Aphra, and Captain Marvel. Captain Marvel has been pretty lack luster as well, with the latest storyline being resolved in a single panel, but Carol Corps for life. Everything else is a pretty good split between DC and Image.
Marvel can reboot all they want, but if they don't have decent writers then there aren't going to be the sales long-term. And dragging out their events for months and months and spread over several titles is annoying has hell as well. At least with DC's current event, Metal, it's kept basically to single issues and hasn't dipped into other stories. I honestly can't remember chunks of what happened in Civil War 2 because there was so much unnecessary crap.