Despite its faults, the Syrian government is by far the least worst. (Rather like trying to choose between Donald and Hilary). The Assad family created discontent amongst the Mullahs by separating church from state, and protects all religions.
Certainly it was a case of the Pot calling the Kettle black when the US criticized Russia's involvement in a war which it stirred up then funded various groups, some of which it soon became apparent were ISL allies and other fanatics of their ilk.
Anyway Assad claimed last year the Russians were more effective against ISIS than the Americans were.
https://en.wikipedia.org/wiki/Foreign_involvement_in_the_Syrian_Civil_War
On 22 November 2015, Syria′s president Bashar Assad said that within two months of its air strikes Russia had achieved more than the U.S.-led coalition in its fight against Islamic State for a year.[26] Two days later, the U.S. president Barack Obama, speaking after a meeting with his French counterpart François Hollande,[27] said: "Russia right now is a coalition of two, Iran and Russia, supporting Assad. Given Russia’s military capabilities and given the influence they have on the Assad regime, them cooperating would be enormously helpful in bringing about a resolution of the civil war in Syria, and allow us all to refocus our attention on ISIL. But I think it’s important to remember that you’ve got a global coalition organized. Russia is the outlier."[28]
At the end of December 2015, senior U.S. officials privately admitted that Russia had achieved its central goal of stabilising the Assad government and, with the costs and casualties relatively low, was in a position to sustain the operation at this level for years to come.[29]