Yea there is certainly a trail but it should be known at the 1-20 experience is fairly different from the rest of the game. All NPC's are voiced and the quests are more compact and you have a personal single-player story line that while continues after Tortage, only takes place at certain intervals.
After Tortage (the 1-20 zone) the game does become a more standard MMOG, and far less NPCs have voice acting (though more and more with each major patch). But even then it is a very fun game with unusual game mechanics, except the spell casting, which while still enjoyable is pretty standard MMOG style spell casting, at least until lvl 40 when you can use Spellweaving.
Anyway give it a try, you can get the game and expansion quite cheap right now and it is a very good MMOG and the expansion is very promising. I'm counting down the hours for the server to come back up so I can dive in!