i know they did not see much action and most of them sank due to the channel surf but some did make it.
You pretty much answered your own question right there. Also, tanks in FH2 are so much more rape now. Here's a scenario I foresee happening:
#1 Americans get DD tanks, and to balance the map the Germans get an equal number of Pz4. If both tanks are on equal spawns the Pz4 will win the fight because it holds the high ground on the beach. After it destroys the Sherman, the Pz4 uses HE to rape LCVPs and infantry coming ashore.
#2 Same as 1, but Sherman is on 5 minute delay spawn like you said. In which case Pz4 wins again, and the result is the same as 1.
#3 No Pz4 this time, and a DD Sherman for Americans. The Sherman uses HE shells to kill Mg42 gunners in the bunkers, while infantry advances at ease up the beach.