i am sure that i am in the minority on this, but i have only killed one NPC and that was in the tutorial.
it took me almost an hour.
so the NPC's don't need to be any tougher than they are for me.
but now that i think about it, considering my success rate so far, tougher NPC's will be the same for me as they always have been.
Actually, I doubt you are alone in this.
Just as with this thread's subject matter, a few people always pop up saying that NPCs are way too easy and need to be made way harder. Right, easy to boast about one's prowess killing computer generated spaceships, and everyone else is (i'm sure) very impressed.
It's a game, if the NPCs are too difficult (or frustrating) to kill, then a third of the game, more probably, is rendered either unplayable, or at least not fun to play, which defeats it's object entirely. Likewise, if every time you are attacked by an NPC you are killed, I doubt you'll be logging on that often.
NPCs are our content, they should be manageable. Their abilities have increased over the last month or so (I'm not convinced the balancing is right just yet between the different ranks), but my own opinion is that FD need to tread a fine line between 'challenge' and 'content'. Just because something is difficult to do doesn't make it interesting, or in the case of a game, fun to do.