Marisa Tomei was amazing in My Cousin Vinny. Her character was a bit unpredictable in terms of personality, but what disappointed me most was that despite being an R-rated movie, there were no scenes that revealed anything R-rated about her. If the main female character in any movie removes enough of her garments so that one no longer has to rely on one's imagination, the viewer (at least in my experiences) feels relatively closer to the character and/or the actress.
At least Titanic had the painting scene.