I think it may be the way you were using it. My wife swipes with big swirling curlicues, and the software appears to suggest random crap instead of every other word. She hates it with a passion.
I draw angular shapes that go from letter to letter, sometimes with pauses on double letters, and only rarely need to correct it. I love it.
My mental model of how it works is by matching shapes (points here, curves there, pauses there) with a dictionary of words that could be created with letters near the shape's distinctive features. I'm sure that's not exactly how it works, but when I act on that mental model, I end up drawing over specific letters, with as clear a line as possible to the next one. Consider trying it this way, and you might find you like it better.