There is an information here about one ATGM attack against Merkava-IV:
"an anti-tank missile slammed into a Merkava Mark 4 Main Battle Tank. One of the soldiers was seriously injured and lost both legs, and another soldier suffered light injuries.
http://www.haaretz.com/hasen/spages/741131.html July 23, 2006
Unfortunately they didnt say about the direction of penetration.
About the vulnerability of T-72: let take all things in proportion. This tank is not more vulnerable that any contemporal western tank. For example according to american information In the first Gulf War the Americans feared to approach T -72 nearer than on 3000 m, shooting at it tow-2, but they tried not to shoot from their tank MG on the T -72 frontal projection . Also against one T -72, supplied with the Chinese system of laser interferences, they usually directed 2 Abrams' and 1 Breadly (Armor, 1991, May June, p 13-20)
This is confirmed by another American source, according to which only 6% apfsd sabots hit iraqi tanks in the frontal projection of + -45 deg. According to the same source during entire time of the first Iraqi company only 14 T -72 was destroyed by the fire of tanks and ATGM (M Held. Warhead hit distribution on main battle tank in the Gulf War. - J. of Battlefield Techn., v.3, N1, 2000
http://www.argospress.com/jbt/Volume3/3-1-1.htm )
The diagram is from the last source: