I get a chance to play the newest tower defense, Prime World: Defenders. As I point out in the video, I've loved tower defense games ever since Warcraft III custom maps and I've just been waiting years for a good TD to bring back that magic. I don't believe it has come yet.
I think it might just be a problem with me--nostalgia or something. I think I have the same problem when it comes to trying new MMOs. I can't help it, I play a new MMO and all I can do is compare it to WoW... which always results in me wanting to play WoW again.
It was the same with this game. I played it, tried it, tried to like it... And then I just bought Warcraft III (because I can't find my old copy) and started playing the old school tower defense games. (I also just beat the campaign again... Talk about nostalgia, that was EPIC.)