I think that Berman & Braga and the UPN suits share major parts of the blame. UPN brought near total ignorance of the Star Trek brand and a set of demands that creatively limited the staff (particularly the "planet/alien of the week" formula). B&B didn't have the guts to stand up to the execs and tell them that Trek and the writers needed a breather; when the show got greenlit, they didn't change up the writing staff enough to keep the show from feeling stale in the first two seasons.
That said, I really have no problems with what Berman and Braga are saying. After about fifteen years of constantly being blamed for every bad decision regarding Trek, they finally get to say their piece. Whether you believe some or all of it, they're giving us more pieces of the puzzle that is the true story of how Star Trek was made and we should be thankful for that.