I still have to finish that lenghty piece there
http://spioenkop.blogspot.fr/2016/06/no-end-in-sight-failed-tabqa-offensive.html but it says that the Syrian Army or what it is left from it has suffered serious setbacks in its offensive against IS.
Found this part quite interesting :
"But perhaps the most serious problem with the different forces fighting for the regime is that some units have become so powerful that these are now essentially private armies. Many of these elite units consist mainly of Alawites originating from Syria's coastal region or minorities (mostly Druzes) and are extremely sectarian as a result. These units make up much of the regime's offensive capabilities, and received the largest share of Russian-supplied weaponry in the past year, including T-90s. The now infamous Tiger Forces, led by Suheil 'The Tiger' al-Hassan and Suqour al-Sahraa' (The Desert Falcons) are the best-known examples of these private armies, and appear to be neither under SyAA or NDF command, but rather taking orders straight from the Syrian High Command or President Bashar al-Assad. This means that if one of these two units operate alongside SyAA or NDF units, different commanders from different branches of the regime's military are issuing different orders while both pursuing the exact same objective. It does occasionally happen that either of the two units take command and issues orders to forces of other branches, but this creates a whole host of other problems as many of the (semi-)independent militias are anything but keen to receive orders from a different branch (which was indeed a common complaint heard during the offensive on Tabqa). This proved to be less of a problem at
Tadmur, where the Russian Armed Forces had considerable influence upon the whole operation. "