I went and gave each game a quick test run during the Bulls' downing of Miami. I think both games are very well-made. I love the controls and their simplicity, as I'm not one who cares for complex games like The Amazing Spider-Man and The Dark Knight Rises and the cluttered controls that often result. Naturally, I'll point out that the graphics could be improved, but I tend to not knock a game for such things when it doesn't hurt gameplay whatsoever.
On 3D Parking, I gave the game 4/5 stars. I declined giving it 5 because of two things. The first is that the music (though I'm sure it can be turned off) was a rather poor choice. I didn't feel like it fit with the game. The more-important issue, though, was the ad placement. I'm not sure where a better place to put an ad banner would be, but at the top, I noticed right when I got to the cones on the second level, that sight was going to legitimately be hindered.
For 3D Traffic I gave that one the full 5 stars. I didn't encounter any bugs, and I was pleasantly surprised at how much I liked the placement of the buttons. They just seemed placed in the perfect spot on the phone, and that does do a bit of good for gameplay. They're easy to reach and in no way hinder sight. I know it's just two buttons, but I still feel like stating a positive point for the game. Again, graphics could be better, but they don't really hurt the game. Adding more cars would be something I would look into, if you are considering ways to improve the game still.