I really am not sure, but I have a distinct feeling I read somewhere that the T-72 and T-80 for example were never built to go 1 on 1 with NATO-tanks, but rather 2-3 or even 4-5 against 1. Is the T-90 built with the same thought in mind, especially since it is a derivative (sorry for my lousy spelling, don't use my english much!) of the T-72??? If so, this has a serious impact on any 1 on 1 discussion, since the Russians wouldn't use the tank for 1 on 1 operations unless in dire... dire straits!
I have read that the Abrams, Leopard and Challenger main guns outrange the 125-mm 2A46M-gun of the T-90, but then again, I don't know to what extent the tube launched missiles of modern russian types are effetive.
In any case it is almost often stupid, especially if a military comander or soldier underestimates his enemy. The enemy is ALWAYS dangerous, is what I was taught in the Swedish armed forces, no matter if he is a militia man or a highly trained Spetznaz-officer. When the enemy is PROVEN to be under par or beat, one can discuss his eventually poor hardware on the battle-field, but never before. As my OT-Captain said, "If you start underestimating in the field of battle you will probably find yourself underestimating from 6 feet under before you know it", the best I could do in translating anyway!
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Don't beat the T-90 up to be invincible, but always be wary of it's capabilities!
I generally love russian kit, since it is often of a more... brutal and easy to use kind, and I am not fond of western "laptops on treads". But that is just my own thought, and I sure as heck would NEVER underestimate one of our Leopards or an M1A2 on the battlefield!