Regime change doesn't have a good track record. That it was an ultimately bad idea isn't surprising. France was the big dog in the Libyan regime change, the US supported it. You can put it in the pile of "What the fuck were they thinking... again?!" But to label it Obama's debacle is inaccurate. It was a Western debacle.
Again, it is mostly a Libyan debacle. Yes, France, the UK and US supported the rebels to the point where they were able to overthrow the regime, but pretending the regime would have stood just fine and chaos would have been averted without that support is absurd. It might well have turned out like Syria - an ongoing civil war with a splash of ISIS - but Qaddaffi's time was running out.
Why is Libya a mess now? I'd blame it less on Obama and France and more on the fact that - like Iraq - Libya simply didn't have a "we've overthrown our tyrant, now what?" plan. The country is fractured with a number of different factions vying for power and no amount of intervention will impart upon them an ability to self-govern.