I've been having a surprisingly easy time leveling my fed sci toon with all plasma torps. Kill times are about the same as they would be with beams (in a Luna btw). It is nice to get the DoT proc up around 7stacks. it has its failings but is fun. Good to have the point defense turret and at least one TBR for AoE clearing.
*edit* meant to say i usually kept one beam in rear for subsystem, but wasn't a huge deal.