You are partially correct but mostly wrong, and your conclusion is very wrong.
The Soviets did export "lesser" models of their equipment (just like the US does today) but the differencesare important to know. The tank itself, engine, gun, etc is the same, radio/comm equipment would differ and extras may differ, such as reactive armor, night vision capability, CBRN protection, etc. The export versions and bona fide Soviet versions are very comparable.
Soviet/Russian tanks take a trashing everywhere they go; Afghanistan, Chechnya, Georgia, regional wars in the CIS countries after the Soviet break-up, etc. Middle Eastern armies are notorious for poorly trained soldiers and unsound tactics, which is a major contributor to the tanks destruction.
For example "modern" Iraqi T-72 tanks were employed as stationary pill boxes in the Iran-Iraq war and this employment was successful enough that the leadership also used this tactic against American M1 tanks in 1991. The T-72 has great speed, a sleek, low profile and a decent main gun so it should have been used in a very mobile "shoot and scoot" role. But M1 tanks are far surperior in every way, armor, gun, comms, CBRN, trained crews.. it was no contest.
Examine the gun on Soviet designed tanks. A rifled bore firing a very conventional round. Against surperior M1 armor this gun is useless. M1 cannons are smoothbore and fire a sabot that cuts through eastern bloc armor like a blow-torch through dry paper.
Examine the armor. A single PG-7V warhead from a run-of-the-mill RPG-7 will penetrate a T-72's armor, which is why reactive armor and stand-off armor came around. Both can be penetrated by the tandem warhead (I forget the designation) fired from the same RPG-7. No single RPG-7 round will penetrate M1 armor, action in Kuwait, Saudi Arabia, Iraq, Kosovo and Afghanistan has proved that. A single intermediate sized anti-tank mine will immobilize a T-72 but an M1 will keep rolling. M1 tanks are routinely used as IED screens because they can take the blast and keep on moving.
Sensitive equipment cannot compare. An M1 can fire on you accurately from beyond the horizon.
A major draw back that has killed many tanks is the fuel storage on the rear of Soviet designed tanks.a hit there (just like on BMP, BTR vehicles) will light it up like the sun. M1 tanks do not have this vulnerable spot.
In short, the T-72 is basically evolved WW2 technology that cannot hold a candle to "western" tanks that are truly modern, such as US M1, British Centurian, Israeli Merkava or German Leopard.