Star trek was something a I had to grow into too, I wasn't much interested in itsince it wasn't a cartoon when I was a kid. However, TNG kept my interest better. After a season or two of TNG I became curious again of TOS, checked it out again, and was hooked. To be honest, though, I prefer the TMP movies best, second TOS, then probably TNG. Voyager is not on the list, really. The cast was too contrived, the plots too much to suspend disbelief. DS9, while a bit shaky at firstturned into a great series.
For me, I like trek for the exploration, adventure and introduction of new concepts.
Except, TOS. TOS was to check out O'Hura.