Criticisms of Bush on record oil profits and prices were because Bush was a servant of the corporate interests.
His whole ideology was to serve them - really, it seems it was to get elected to get power for the interests who paid for his campaigns. This is why he had a massive political machinery that went to the lobbyists, and cared about one thing, getting corporations to stop giving any money to Democrats and start only giving to Republicans. This was not 'business as usual' but a whole new level of selling the government to the highest bidder.
Interests were told if they played ball - which meant not only the donations, but actually hiring Republican-selected people into their donation staff to monitor and direct behavior - they could literally write the laws they wanted passed; if they did not, the Republicans would ensure their interests did not pass whatever the benefits and whether they deserved to. It was called the 'K Street project'.
Another result was that hundreds of government oversight officials who were supposed to represent the public, came from the companies and lobbyists of the very industries they were supposed to regulate - largely killing the oversight that was intended under the law for the public benefit.
So, whatever the facts, Bush deserved huge suspicion - from his families' decades-long Texas oil affiliations and corporate servitude - over the issue.
Maybe it was only his hands-off approach to letting Wall Street get away with what they wanted; he was still a 'willing servant of corrupt interests' as their hired hand.
Obama is currently doing their bidding as well, on this windfall tax issue.
His motivations are less clear. A case can be made that his motivations are also to do the bidding of powerful interests; but it's also plausible, for example, that he simply knows that the tax cannot pass with opposition from Republicans, and there is no reason to spend his political capital proposing something that won't pass, and will only give Republicans ammunition in 2012 for calling him anti-business.
We do know what he has not done may of the abuses of the Bush administration; but there's a long list of serving those interests over the public as well.
It can be debated how much he's a 'willing' servant versus how much he simply can't get things for the public done because the interests have a lot of power.
Here's a summary from a website that proclaimed his campaign promise on an oil windfall tax was broken:
At the time, we thought it was too early to call this promise dead. Gas prices are unpredictable. But even as gas prices rose again this year, Obama said nothing about a windfall profit tax. It hasn't been included in any of Obama's three budget plans to date. And we couldn't find anywhere that either Obama or anyone in his administration has raised the idea. Now, even if it were to be proposed, experts say the political calculus -- with Republicans controlling the House -- makes it almost impossible that it wouldn't (sic) become law. We rate this one a Promise Broken.