Well if you want speed, the Horus is the way to go- the Loki is a bit slower than that and carries much less weaponry. The biggest problem with the Loki is its armor in my opinion; it cannot withstand flak bursts for nearly as long as some other fighters can (most light fighters, even), and so you have to avoid capital ships at all costs. Also, it can't carry enough tempests, which is one of my favorite anti-fighter weapons.
![:D](https://www.hard-light.net/forums/Smileys/HLP/biggrin.gif)
You can certainly perform well in that fighter, but not as well as you could in another fighter. Also, remember that the Loki was essentially a failed project; it was supposed to be a stealth fighter like the Pegasus or Ptah, but some flaws in its design rendered that capability useless, so it did not turn out as good as it should have been.