Honestly, I also feel the same. This game can be a bit complicated when it comes to the playing of what monster is better and where. I'm a fairly educated individual; however, the game can certainly stump me at moments! So you're definitely not too dumb to play, but there are just times when it doesn't matter what you've got card wise, you're gonna lose so I try to have that attitude and not get too down when I keep losing rounds.
I'm so glad you wrote here though because I felt like maybe I was a bit too dumb for this, and so it's nice to know someone else out there kind of feels that way at times. I figure if I can hang in there well enough to keep my knowledge increasing, then maybe I'll eventually get this thing.. HAHAHA!
Good luck if you decide to do the land! Have a great weekend!