I recommend trying portal and portal 2 first in 3d using Tridef before you judge it to harshly. The thing you have to remember is, these games were never made to be played in 3d, and even the modern ones aren't specifically made for 3d from the ground up. So, there's always going to be problems and visual anomalies.
The portal series in 3d is outstanding, for a couple of reasons. It's an older game/engine so you can easily maintain 100+fps even in 3d on a modern computer. The theme of the game tailors well to 3d gameplay. Going through portals in 3d is epic. So is picking up the cubes and other items, the visual is amazing.
Just be sure you setup the 3d settings properly in Tridef. The default profile's are almost always not optimally set. They don't account for resolution, viewer distance, monitor size, other monitor differences, amd/nvidia differences, etc. They're just some generalized profile that is 'decent' for most users.
