The T-72 fielded by the Iraqi army was probably the T-72A version you did see blow up, that tank was the export version of the older model and did not have any armour uppgrades, and yes a lot of T-72s are still in service in Russia but these tanks have been significatly uppgraded as the T-72BM and the T-72BM1 that got reactive armor upgrades.
The T-90S/M and the T-80UM Bars got shotora protection kits that effectivly defend the tanks against ATGMs such as Javelin and french built Milan 3 systems. But still yes ATGMs will be a effective weapon even with the shotora system on the tanks. But the Russians got the Kornet system that is equivalent effective against M1A2s as the Javelin probably is against T-72BM1s and T-80UM Bars and T-90 tanks.
Good site with different T-72 types: http://www.jedsite.info/tanks/tango-...72-series.html
Another good site with upgrades to older tank models: http://www.morozov.com.ua/eng/index.php?menu=m1.php