Let me preface by saying that I don't generally like MMO games. I'm not a big fan of mindless gathering and grinding, or pay-to-win PvP. And sometimes, I just like to be left alone. But, since I enjoy the Conan mythos, I decided to give AoC a try. Besides, at free-to-play, the price was right.
Age of Conan isn't revolutionary, but it certainly exceeded my expectations. I joined the PvE server, and I have the luxury of playing it as a single-player game when I want to, and teaming up when I don't. Even playing solo, levelling up occurs at a reasonable pace thanks to the hundreds of quests to discover and complete. The character classes are balanced enough for PvE that you can choose one to suit your play style without having to worry about being too gimpy to advance. And, what I like best of all, is that there are certain single-player Destiny Quests centering around the plot advancement of your own character. Just imagine? An MMO with a little plot. So, all in all, there's really nothing to lose by taking a chance on the free play.
Just a warning, though - free play can be satisfying, but only up to level 80. Even though 80 is max level, subscription players will continue to advance through an Alternate Advancement tree - so level 80 isn't really the end of your character's evolution. But even if you play to 80 and don't choose to buy a subscription, just getting there can be worth the trip.