I didn't know the Creature evolved into a half-human form, interesting.
I just ordered the Legacy DVD collection so I can sink my teeth into all three Creature films when they arrive!
I remember being surprised about the Creature's transformation the first time I saw this movie. I actually remembered having that feeling more than I remembered the movie. I found it a huge disappointment at the time, being around 12 or 13, and I think that still affects my opinion a bit.
I know you'll enjoy that collection. The original is a classic and the other two certainly have some great scenes. You get the "Back To The Black Lagoon" documentary, too.