You'll hear no argument from me that warrior has serious problems right now, but I still don't advocate nerfing anything Paladin has right now except Mysterious Challenger.
If Shredder and Dr. Boom got their well deserved nerfs that would also knock Paladins down a peg.
I agree, though Shredder and Boom are good enough to be used by any class so they are, in a sick way, inherently balanced. It's not like something like a Grim Patron which was only OP in one specific deck. Hell, even Aggro Druid uses Boom. What other standard meta aggro deck has ever used a 7 drop? It wasn't that long ago you would never see one with anything over a 4.
This style of play is what paladin class is about. It's the board centric class, it's like the only class where you can tell if they can kill you next turn or not with just what's on board plus 4 in most cases. They have no burst damage instead they have good minions. Even aggro paladin isn't about huge burst. Murloc change that though, that card can be problematic. Now MC is just too broken even for this class but rest of their kit is still reasonable. Paladin isn't going to be able to play something more complex though with this design, they're about 'honest' fights, here are my dudes every turn, can you deal with them? It's simple but as long as the dudes aren't utterly broken like MC is, it should be fine and beatable.
Shielded Minibot is too hard to remove. You'll either trade two cards, seriously weaken your board, or spend a lot of mana. And if you can only pop the bubble, he'll just Coghammer it the following turn. But if you leave it alone, he'll wreck you with it. Divine Shield is kind of a bullshit mechanic anyway. I'm surprised we haven't seen an uptick in Blood Knights again, not because it's an amazing card but just because of the sheer salt factor.