The charge always levelled against Montgomery was that he was too cautious, only fighting battles when he knew the odds were heavily in his favour and incapable of exploiting opportunities on the battlefield itself. At El Alamein the Axis forces had over-extended themselves whereas we had short supply lines and time to build up our forces. Even then he struggled and it took two attempts to achieve the crucial breakthrough.
I'd say it was more like our Stalingrad, where the Russians really had their backs to the wall and were forced back to the banks of the Volga. They were just about hanging on but were saved by a major operation that hit the weak flanks of the German armies, far behind the front and cut off the 6th Army from the rest of the Germans to the south and west of Stalingrad. Then they turned inwards and destroyed the pocket of German forces that were left. I'd say this was more our Stalingrad than El Alamein.