Selective memory you have when all you remember are two ports.
I seem to remember Perfect Dark Zero, Project Gotham Racing 3, and Call of Duty 2 being at launch as well.
I don't think any of those screens are a particularly impressive leap over their Xbox equivalents. PDZ looks hideous and using PGR3 photo mode is a bit misleading, it doesn't look as nice during gameplay. You're right though, you'll see a few fancy lighting effects, textures or shaders on the launch games but they will be distinctly current generation experiences underneath, that's always the case.