[Marcello]

"Crew compartment is so small, that if you are higher than 1.75m you will not fit in."

Not exactly news.The T-72 is a tight fit.Did I ever state otherwise?

"All thee crew members are surrounded with ammo"

In a sense, yes.However at least the T-72 does not have its driver sitting in the very middle of an ammo depot, even if of course the turret still has rounds strapped to the walls and everywhere.

"If T-55 is penetrated, there is a chance that at least one or two crew members survive."

Penetration may mean a lot of things.TOW-2 and M829A1?
Then I am afraid I would not want to be in that T-55.
Penetration with lower performance rounds? It will happen.

"If T-72 is penetrated,no one will survive."

How much data do we have on T-72s being hit with low performance ammo? Not much I suspect.So I would avoid such broad statement.

"About those Centurions, During 1973 war, all Israeli Centurions were hit.Some of them were repaired, and fought another day again.I read stories about Tzwicka fight against Syrians (dont remember name correctly), where his three tanks stopped Syrian tank battalion. Syrians even thought that they fighting against Israeli batalion, so they withdraw.All his tanks took many hits, but were capable fight back."

That does not answer the question.How many of those hits were penetrations and with what internal effects?

Furthermore were they shot at with ammo comparable to what was used during GW1? No of course.

"By the way, you cant compare T-72 and T-62 this way. T-62 has bigger turret."

And a fourth crewmember inside it.Roomy is no the first thing I would associate to the T-55 either.

"US M60 has 3 times more space inside than T-72 (maybe more...)same for centurion and other western tanks"

That may help somewhat.How much is debatable, given that there are several factors to consider (the hydraulics fluids issue being an example).The T-72 may well be less survivable than tanks like the M60 but I doubt that the difference is that great.
The real gap is between 3rd generations MBTs and what came before.

As far the game goes remember: average tank with rounds strapped to the walls 4,Abrams with blown off magazines 6.
I doubt what we are debating warrants a whole point of difference.