not at all. von manstein was one of the greatest generals ever.
see no one talks about the eastern part of the war or what happened in belgium/france before the americans got involved.
manstein fought in both great wars and his men took sevastopol in ww2 in a tough battle.his units advanced hundreds of miles in days.
von manstein withdrew in a fighting and strategic retreat in southern russia near the collapse of army group c. the fact that hitler dismissed him tells you he was a great general.
most military strategists regard him as one of the greatest generals ever.