Having pondered that question very deeply here in California where voting for "Republicans" like Romney had been going on for decades, my answer: ABSOLUTELY YES, Obama was a "better" president than Romney would have been in that Obama is a DEMOCRAT. Better to fight tyranny you rejected than tyranny you elected, akalinin.
Thank your lucky stars that Romney LOST because if he'd won, YOU would be responsible and accountable for ENDORSING all the government tyranny (the same on FIVE MAJOR FRONTS as the Democrats, including government-run health care, the homosexual agenda, on-demand abortion, the environmentalist global agenda, and activist DEMOCRAT judges, not to mention amnesty and gun control -- do your due diligence on Romney before you start prattling about what you assume he wouldn't have done) that the guy you voted FOR "against" Obama would have done.
If Romney had won, REPUBLICANS would be responsible and accountable for severe, hard body-blows to conservative Republicans trying to build up strength within the Republican party to reclaim it. When you voted for Romney "against" Obama, you may have INTENDED to move things right, but the person you endorsed would certainly have ACTED to move things left.