Nothing wrong with Extend Shields, Face. It gives people a chance to live, compared with quick deaths at the hands of 5 Klingons.
Right now, the Full Impulse + Engine Battery + Evasive Manuverse + Ramming Speed Exploit needs to go in both PvP and PvE (those who seen it in action with the Crystal Entity knows all too well). It should only be activatable when under 33% Hull.
And for Viral Matrix, it shouldn't be nerfed, but there needs to be somekind of anti-hacking Science console that gives you a chance to resist it.