
Originally Posted by
Gaargod
I always say there 2 elements to making a unit 'broken'. One is it being undercosted, the other is it being overpowered - yes, they are different.
Undercosted is when something is just too cheap for what it provides. E.g. Strike squads. Compare to the basic vanilla marine - for 4pts they upgrade bolter to storm bolter, upgrade close combat weapon to power (force) weapon, get 2 excellent psychic powers and the Aegis. If you compare them to the much superior Grey Hunters, they're still a great deal for 5pts more. However, with the possible exception of the very silly Warp-quake power, they're not inherently overpowered, just underpriced.
Overpowered is something like psychotroke or rad grenades. They're just silly debuffs, which should not exist.
Example: death cult assassins - Ws5 I6 S4 A3 power weapons means they chop stuff very well. But to be fair, T3 5++ isn't amazing protection on the return (it's not bad, but it's hardly superb). The problem is that they only cost 15pts.
Decent comparisons are slightly hard to find, but Bloodletters aren't a million miles away. Bloodletters go down to A2 I4, but get T4 and furious charge. Fearless and the stupid daemonic assault rules make it difficult even then but... Point aside, bloodletters are 16pts. This would probably be fine (or a slight raise for DCA), except for the fact they can take transports. Transports, more importantly, with the assault vehicle rule. This makes them a lot more difficult to deal with.
They are then made much worse by being in Henchman squads. Where you can take a crusader with his damn storm shield for 15pts. And he's still got reasonable stats and a power weapon! Mixed squads of these bad boys are then, especially in assault vehicles, very very difficult to deal with.
Purifiers are just stupid. Start with the underpriced strike squad member. Then trade his Warp-quake for Cleansing Flame, which is a foul thing, and give him +1A (and +1LD, but not very important as Justicars are all Ld9). Oh, and his weaponry options all get a lot cheaper/more access. Admittedly, he becomes an elite choice not a troops, but you can actually make them troops if it comes to that. They're straight up underpriced, and cleansing flame makes them overpowered.
Lots of the army is like that. You will struggle to find a unit which isn't one, or both, of the two to some degree. When you start including buffs, it becomes almost impossible.