Campbell just wasn't right for this movie. He's a novice to the comic book world, the sci-fi genre, and with grand visual effects. It was my biggest worry about him and sadly it proved to be valid.Yea but Avatar had James Cameron and WETA. Unless WB get someone of his calibur for the sequel, and ILM or WETA, it's only going to cost more money.
George Lucas (ILM discounts notwithstanding) pulled off six times as much scale with 25% less money. As did Peter Jackson. Hell, Michael Bay gives you 300 million dollar looking blockbusters with half that amount.
It has everything to do with budget management. You need to know how to use your funds.