I got motor within 2 seconds, without even looking at the letters. I'll admit, sometimes, I have to stare at those letters for minutes before I get it with some drawings. One guy sent me a drawing of a circle, drew 8 very short lines evenly surrounding it (basically all 8 inter/cardinal directions), then put a big smiley face in the circle. I couldn't figure it out (before I figured out the random letter cheat, explained below). Had my wife and kids look at it. Took them about a minute...spider. Some other person drew a black, half-assed triangle shape, then filled it with yellow. Somehow I was supposed to know it was iron.
A cheat is if you can't figure it out, make a note of the letters available, then quit out of the game. Jump back in (you'll watch the other person guess yours again, which you can skip) and the random letters that are not in the world will change, thereby allowing you to know which ones are in the word. You don't even need bombs. Because of this, I've never given up on a word, and gotten them all.
Every so often, I feel like giving the other person a challenge, and I don't draw something (heh) as good as I possibly could, because it would make it too easy.
I think the colors are too expensive.