In regards to Burning Abyss and Necloths... Yeah, the former became Tier 1 instantly with just three main deck monsters and Dante, and are pretty much designed to never lose advantage. The latter... Can instantly summon Ritual!Trishula, and get a free Shooting Star Dragon, thanks to the effect of one of their spells.

Don't know enough about the other two, though Spirit Beasts don't seem broken, from my testing. Potentially annoying, but nothing devastating. Though I guess I should note that their Contact Fusion mechanic lets the Fusions split up to avoid Bottomless and stuff. But that's balanced out by the main deck guys only getting 1 special summon each per turn. So... Yeah.