If playable means functional, sure, if it means actually a good idea: No.
Because dear fucking Lordy where do i start with the blatant mess that Bloodsuckers are:
1.Burn supposedly is their weakness? Nope, lower level Bloodsucker doesnt have a multiplier high enough that makes them that dangerous with all the powers they got to stomp anyone trying. And beyond that any Bloodsucker just opts immediatley for nanites or tearing through brig for the reflective trenchcoat.
2. “Just sneak up on them.” Thermals make it near impossible to catch one with their pants down, and the one minute of day that has them vulnerable basically is ultimately nothing unless the Bloodsucker practically has a death wish already, hell i doubt they would even be too phased just waiting it out on fire and maul whoever tries it.
3. Stun immunity, it doesnt bloody work, you can say what you want, the testmerges have made that painfully clear: Bloodsuckers can´t be stopped, be it all of sec swarming, someone actually trying lasers or even the Bloodsuckers being newish, that ability makes Hulked out Changelings look equivalent to a armless clown.
Those things and the fact in all 4 testmerges i seen not a single Bloodsucker seems to have managed to get himself killed and they just curbstomped everyone in the round as they want leads me to think of them just as a powertrip of the worst kind that best is left buried ultimately, MAYBE admin spawn, but dear fucking lord don´t add them even remotely as they are into rotation unless you want every few rounds to be a hot pile of shit at the whims of whoever got it.