I’ve argued that Murloc Shaman is the best deck in Wild, for now. With that said there are some thing the meta can do to knock Murloc Shaman down:
Aggro and Midrange can start playing Hungry Crab. For instance my Jade Shaman swapped tech from Golakka Crawler (pre-patch) to Hungry Crab (post-patch) and it has done well against Murloc Shaman/ Baku Paladin and (insert Warlock deck) continue to keep Jade Shaman (at least my list) as a tier 2-3 deck. Token Druid, Zoolock (doesn’t need to though), Odd Paladin, and Nine Lives Hunter can all tech in Hungry Crab with minimal to no negative repercussions to the deck strategy.
Play non-combo Warlock builds: Last month when I played Murloc Shaman (my build is slightly different as I think Tinyfin is garbage and running only 1x Maelstorm is dumb) Warlock, overall, was the best class to at stopping me. Carpet Zoolock will destroy Murloc Shaman most games at it can deny board so well. Cubelock and Evenlock are good especially against the Tinyfin version as 4 cards become nearly unplayable (Sludge Slurper and Tinyfin) unles syou can combo with a Seer.
Dragon Control Priest: I didn’t face this deck but it is the only Control deck I am willing to use right now between Big Priest and Murloc Shaman. You have a ton of board clears, Mass Hysteria is good enough to use (I might put one in), and the early game can be minimized through your own minions and Potion of Madness. At least for me it is doing better than Warriors were doing against me last month.
I want to see the meta adapt to Murloc Shaman before saying it is broken. Hungry Crab is such a game winning play if it hits early, at least for me it has been, that I’m not sure the deck can survive being targeted. If you play against an Even Shaman, for instance, it becomes quite clear how fragile Murloc Shaman is to tempo loss compared to it’s ‘brother’ deck in Even Shaman which is a lot more resilient as you can’t target it as well.