In general I'm glad this race is over, mostly because for many years it has been more of a lottery than an actual benchmark after the pre-season, thus making assumptions out of it is risky to a degree (yes, I know that usually the driver that wins this first race usually ends up being WDC, but statistics are there to be broken, not followed).
Out of all the drivers, I've been most impressed with Trulli. Surely, he had done nothing that is truly remarkable or awesome, but if you think he came out last from the pits and ended up third before FIA penalized his car again, it's quite telling you that his team is up there next to the Brawn GP ones.
Best drive would go for Kubica and Vettel weren't they both to crash into eachother (if I was a steward I would sign this off as a race incident), or Rosberg wasn't his performance or tyres degradating. All in all, it's hard to get a 'best at' without naming a BrawnGP driver, however I would say that as many incidents the race had, it was more a matter of being at the right place at the right moment than anything else.
Waiting for the Malaysian GP, I think everything is yet to be decided in the means that this australian race has shown plenty of action but since many cars did not manage to finish, the result is not as meningful as it will be on next races with less incidents.
All in all, pretty happy there are much more things going on in the 2 hours than just one driver stopping at the pits, the pace of the race feels better, there actually are more chances for overtaking and the drivers are closer, so all the rule changes are working (the KERS is the only one I'm doubting, either because the implementation was poor on some teams or because drivers were not using it properly) and making it more exciting and close-knit. Apart, it seems the level of the broadcasts has gone up, so it makes more for a spectacle, which is always good as long as it doesn't kill the essence of F1.
My 2 cents