@ karterfreak:
I only recently started taiko and I agree that the 100% first thing a beginner needs to focus on is differentiating don and kat. HOWEVER, when I started, a lot of easy maps I wanted to use for practice had simply different-timing patterns for only dons or only kats, or just a don-kat-don-kat-etc alternation with no variations in it, and I felt like I'm not learning anything like that. The maps should be slow enough to give beginners a chance to follow their reading, but not too SIMPLE because then it won't teach anything and it'll be boring to play.
i.e.: for beginner: Fast slider speed + high bpm + simple patterns = very bad, won't teach you much at all.
Slow slider speed + low bpm + somewhat complex patterns = very good, it's fun to play for beginner, playable, and teaches him the game.