Why I like FF games:
The summon sequences. They are really cool.
Plenty of FMVs. This is also another cool feature which PC games usually don't have too much.
Storyline. Of course. I play FF for its story line. And also new GFs, or Eidolons, Magic, fighting new bosses, mini quests, etc.
I've played Baldur's Gate for a while ... but I quit as it was rather too hard to play IMO... and I don't really like the battle system in Baldur's Gate. I'd prefer Diablo II:LOD Battle.net in killing/ adventure/ real time.