Yes....it is designed to be very easy to play, even for people who have no musical experience or ability. At its simplest level, you finger just one string with your left hand while you strum all three with your right hand. Any fret you finger the string at is part of a major Scale (do re mi...), so it sounds good no matter where you finger it. Strumming all three gives you a full, interesting sound, and only fingering one string means you do not have to struggle with complex chord fingerings. Even if you play it completely at random (which I actually recommend at the start), it sounds musical and melodious.
Beginners will naturally be slower than more experienced players, but even playing slowly it sounds good, good enough so that people who try it usually feel "hey, I think I can do this, it sounds pretty Ok even though I know nothing about music or playing Strumstick." The whole point of the Strumstick is that it sounds good no matter what you do, so it is fun, not frustrating.