Tmnt, I agree, the graphics are improving, but the interest in the game is decreasing with each installment, and this is the case with all games.
The graphics in the third installment don't bother me at all, and considering my generally positive attitude towards graphics, it didn't affect my interest in the game. I don't care about the graphics. Even if it were made of cubes, the main thing is that the meaning of the game and the interest in it haven't diminished.