You need to watch the new remastered STTNG on Blu-ray. Seasons 1 and 2 are out so far, and with new HD film transfers, remixed sound and improved special effects (done using the original optical elements, not some overdone computer effects), I think it's actually held up extremely well. I haven't seen the "original" STTNG episodes in quite a long time, but from the brief snippits included on the disc's documentaries, the special effects looked quite dated... but now they're really quite good.
