Basically all of you are right. Here's my perspective on them: Zoroark Break is super viable because it's pre-evo is the new Keldeo/Absol, as well as being a 1 energy attacker who can basically kill anything. The difference between this and Gengar is that this takes less energy, and it can use Base Zoroark's stuff. This is basically the only straight forward good Break, also because you can play the Base Zoroark without it.
Marowak Break: It's not so great at all. Base Marowak is mediocre, and this only hits hard late game. This might have seen more play if the Bodyguard Marowak was printed, but since it wasn't, this has to be stuck with Bone Windmill. While it isn't horrible, it is only deserving a 1-of in the Marowak deck, if, at all.
Raichu Break: This is basically the worst Break there is, and the only reason that this is at all playable, is because the Base Raichu got absolutely massive play before the announcement of the Break. I do however, like how you can use it to finish the game for a big 170 swing for just a DCE, and a Lightning energy. It would be completely unplayable if it had 2 lightning and a Colorless, so that's a big difference. I see it being a possible tech in straight Raichu/ Bats as a 1-of, but who knows.
Chesnaught Break: This is probably the absolute worst break there is. The only thing keeping this in front of Florges is that this is a grass type with massive HP for not being an EX. I dolike about it that you can hit for hard amounts of damage, as well as use touchdown to heal yourself, AND have Spiky Shield, so you don't have to play Muscle Band. Not very solid, but not soft either.
Florges Break: The worst of them all. It's Ability is almost useless with the upcoming reprint of Max Potion, and for those of you who don't know, Aromatisse is in every Fairy deck there is. It would be a miracle if you could make a good deck with this card, but the deck just becomes too clunky if you do play it. I saw an okay list that my opponent managed to get out 2 of these, but the fact that Xerneas EX as the only attacker( because of clunkiness), just couldn't beat me.
Noivern Break: My personal favorite Break. To put it simply- annoying. This can abuse DDE, as well as the infamous Fuf Noivern, and Judge you every turn and constantly be a pest and may score some easy KO's if set up. This and Zoroark are probably the only 2 Breaks worth playing more than 1 of.