I'd give this episode a score of 11 if it were possible. An epic space battle, scores of payoffs, all done with an itellegence which raised the bar for televised Science Fiction. This is why this series will be the benchmark by which all series to come will be judged.
The end of the Shadow War :)
4 words : The Army of Light. The entire Alliance, Vorlons, Shadows and several First Ones thrown in for good measure all pounding away as Londo and Vir make their play on Narn and Centauri Prime. Sublime and with an intelligent philosphical ending to it all.