Just look here, where a significant part of the medals were received
About Odessa, the main reasons of Soviets retreat were the fact that a Romanian special assault unit had done a surprise raid and taken control of Odessa water plants, and following Soviet counterattacks couldn't take them back. Also Romanian army had advanced enough to put the Odessa harbour in the range of the heavy artillery, so even if the Soviet navy can still keep the sea route free they couldn't anymore reliably supply Odessa with troops and war materials. Soviet air force also couldn't obtain air supremacy in Odessa region, despite Romanian air force being significantly smaller.
So at that point was just a question of time until ODessa would have fall, that's why the sudden, quick and massive evacuation ordered by Soviet high command, they did it as they still had a little window before to become impossible or way too dangerous, and transfered those troops in Crimea.
Considering that our attacking forces were only sligthly more numerous than the defenders, who were well entreched in positions and better armed, and that pretty much all sieges of big, strategic cities produced lots of loses