Oh, it's quite OK! I haven't used it myself, but my wife has. We don't often head out the way it goes.
It's really great for tourists though, it does a good job of connecting one of the major tourist areas (Thao Dien) to the city center.
I'm hoping that later extensions will do more to alleviate traffic, e.g. head out towards Nha Be or something. Although I hope to move to a quieter city long before any of that.
