Chrome being faster and less bloated was their sales pitch. Keep in mind that Chrome came out as a counterpoint to IE and Firefox in what was then still a very desktop centered market. No one was talking about battery life back then. The solution to battery life on laptops was to create better power profiles, lower powered hardware, and shove in bigger batteries.
Chrome is still a huge improvement compared to the browsers it was competing against. Chrome changed the market and now the other browsers are competing in the world Chrome created. So while Chrome might fall behind in some areas now, it's naive to say that it's become what they made fun of.
Chrome using less resources than Firefox and IE was their sales pitch.
Now they've become what they made fun of, while Firefox is smooth as a baby's butt.