I, too, have only seen Mezentseva on video (Swan Lake and Pas de Quatre) and I can't say she left much of an impression on me either way. She appeared quite secure technically, although I have trouble looking at her feet (it makes me wonder how those arches got into the Vaganova Academy). Beautiful long limbs, though. Her acting seemed flat to me, especially compared to the wonderful expression of Kolpakova, Yevteyeva, and Komleva in Pas de Quatre.