Hrm, I had a different response. My wife & I played this for the first time last night and determined it was NOT good as a 2-player game.
First of all, we had the experience of several turns going by where we were just drawing and discarding waiting for a certain card to come up. That to me is kind of boring in a card game.
Finally, we guessed that it might be more interesting if we removed 1 or 2 colors from the deck before a 2-player game.
That way, resources would be scarcer and there would be some competition.
I strongly agree with you as this game resembles a lot to Gin Rummy, that has four suits, and is designed as a skill game for two players.