superior armour?
germany had the most superior and advanced armour in the war and definently outgunned the russians in that department.
All of which were outclassed by the JS-2 and 3.
T-34 owned all early German tanks.
The T-34/85 could deal with the later German tanks, though was likely to lose a 1 vs 1 fight - though of course, it would usually be at least 5 vs 1 in favour of the Russians. They had a vast superiority in numbers and were also faster and more mechanically reliable.
The JS-2 could take on all but the heaviest German tanks on equal terms. It had a huge gun for the times, 122mm. A King Tiger or a Jagdtiger would probably outclass it (though not by much), but again these were only produced in small numbers, were slow and suffered breakdowns all the time.
the only real advantage the russians had was the effectively cheap tank designs which was pumped out in mass production in the post 42 era.
Indeed - and in WWII, quantity was better than quality. Stalin himself said that 'Quantity has a quality all of its own'. He was proven right.
Tiger I/II = best tank of the war
No. The JS-2 was a better tank all-round, with a more powerful gun and better speed and reliability. The JS-3 was better still but it's not even known if that was produced in time to see action in WWII. The Centurion is similar - it was built within WWII, was better than the Tiger, though it never saw action.
For the Germans, the Panther was probably their best tank. Due to sloped armour it was almost as durable as a Tiger, and the high velocity 75mm gun was as deadly as an 88. It was easier to build, faster and more reliable than the Tiger.
and above that the average german soldier was better trained , equipped (initially speaking) and didnt have the threat of kommissars behind them
The threat of Kommissars actually spurred conscripts on - I'd argue them as a plus point for the Russians, as inhumanly brutal as they were.
It's not like the Russians had no good infantry though. Siberians were well known to be tough and competant, amongst others.
guided missile systems (V1 , V2)
guided missile systems (V1 , V2)
They were`t guided , not at all - altthought the were in a way effective (especially v2 against there was no possible way of defending)
EDIT= germans experimented with guided gliding bombs - but afaik never to large scale
The Germans did actually invent wire-guided air-to-air missiles for downing bombers, but they were only tested very late in '45.