Honestly, neither of these are huge gamebreakers. I liked that Warbringer cleared roots and snares for me when I was tanking, and I barely even noticed it in PvP: it was like a free self-cast Hand of Freedom. As for nerfing Shield Slam, well, like I said I don't stack block value so a lower block value cap on the ability wouldn't really affect me. Irritate me? Yes, it will do that. But it isn't a game breaker either. Of course, since as the commenters mentioned yesterday prot PvP warriors don't stack shield block value at all (I know you guys don't read my posts, Blizzard, but if for some reason someone is, look at all that ArP. Look at all that lack of block value. It is ArP that drives the prot PvP damage machine. ArP, not block value. Just thought I'd mention that) then I fail to see any point to the change either.
So there we have it: Warbringer gets changed and Shield Slam might get changed which is like taking a club away from a guy who is shooting people.