Although expensive as mentioned by others, I see its value as "reach" card. Take Venoms weapons for example. His multigun and pistols do 2 damage in one activation at best. Their value derives slowly over turns, especially when setup early. I'm imagining situations where elite minion's (6/7+ health) show up or you've reduce the villain to <10 health but wont make it further than a turn or two.

Thats where Fusillade fits. Its a card that gives flexibility at the downside of being rather expensive. Its a card for quickly handling bigger threats.

Worth noting : taking 1 damage isn't a cost so you can do it even if you have a Tough status ! I just recently realized that :p

Also, that is a very good card !
If you have a Crew Quarters or good healing in general you can basically pay for this every turn in solo or multiplayer :)

Since the last review, there are a bunch of good defenses like Side Step, Jump Flip, and Powerful Punch that this pays for and the Flow Like Water deck that incentivizes playing lots of Defense events. I don't think you can play this outside that deck because you need a lot of Defenses to justify this card, and playing a lot of Defenses gives you diminishing returns without that combo. You can also play lots of Defenses in a multiplayer game where it's possible to defend twice or more in one round for other players.

Side Step is a nice part of the Flow Like Water + Defensive Energy deck. If you aren't in a defense synergy deck, blocking with allies, stunning, or using tough cards is generally a better way to prevent damage. There are a bunch of 1-cost defenses, but unlike Never Back Down or Desperate Defense, you don't need to defend with your hero's basic power. If you are trying to trigger things like Hard to Ignore or Unflappable, you might want a few extra ways to prevent damage like Energy Barrier, because villains will often attack for more than 3 damage. Jump Flip is another close comparison that I prefer because Protection is light on threat removal, but in the Flow Like Water deck you can definitely play both.

Warlock is truly an awful card. The base stats are among the worst in the game for 3-cost allies. The heal ability is actually ok on rate - 1 resource becomes 2 thw/atk as you choose. But it is SO SLOW. A Sidearm can speed things up a bit, but in the aspect with Med Team and Defensive Training, Warlock is far from the best way to do a Voltron strategy. X-Factor is a useless trait. I sympathize with the designers because a self-healing ally does have potential to be broken. If the cost were 2 or especially if one of the stats were 2, Warlock would become very strong, so there is not much to play with in the numbers. As it is, Warlock is just too weak to justify playing.