I say that after throwing some caution to air because I understand that every new thing has some initial resistance or pushback due to the "past comfort zone" effect.
But having said that, I feel the aesthetics of the old site was much better than the new one. But then again, I'm from the old-school world who also prefers old reddit to the new one in browsing experience, so my opinion could be biased! But even considering the modern web design, don't you think the black icons on the top right have a somewhat odd look? And the "21 languages" feels a bit verbose, the I10N icon already conveys what that dropdown is about? And finally, that scrollable sidebar on the left looks a tad ugly?
I just hope this is just a beta stage or something of Wikipedia's new version and a better one will evolve soon! But that's just one humble unpopular opinion, me thinks!