I have seen many posts in this forum severely underrating the Animalism discipline, but, as I play with a Gangrel (unofficial patch 5.5 Basic), I find that Animalism is extremely powerful, even game-breaking.
1. Nightwisp Ravens - incapacitates the victim, allowing you to easily feed on it, stealth-kill it with ease, or employ a stealthy approach in areas where you don't want to kill enemies. So what if it breaks the masquerade, you're supposed to use it in combat areas only, so it is no worse that Hysteria or Trance.
2. Burrowing Beetle - pretty useless, minimal damage, but prerequisite for the upper-level disciplines.
3. Spirit Wolf - kills one enemy at a distance (almost any enemy, even low-level vampires). In combination with Nightwisp Ravens, you can just stroll in an area stealth-killing enemies and feading on the remaining ones to replenish your blood. On par with Vision of Death and Suicide.
4. Bloodsuckers' Communion - kills one enemy at a distance, while also returning an equal or greater number of blood points than it was required to cast it and not demanding that you to stay still for the blood to return. This spell is a game-breaker, since it is the only ability that it truly self-sufficient, in the sense that you can crouch, cast it at range, and stealthily kill one enemy at a time, while not using any of your blood reserves.
Spoliers ahead:
Spoiler
With this ability, I have been able to clear the Giovanni Upper-Level and the Socieity of Leopold without firing a single bullet (except for the bosses, of course)