Well....I wouldn´t be so harsh in words, but honestly I agree in many points with you.
AI is really bad, eagle eyes of the enemies are really not realistic and the maps are only made for a very linear play through. The Germans and Russians are always in the same places, and do always the same things. There is no fun to repeat any level. I started ONLY the DLC Hitler Level twice, but did not play it the second time to the end because it was boring already from the start.........repeating the same things always doesn´t make much sense.
If the Levels and maps wouldn´t be soooo linear as the are and the enemies would behave more realistic and clever then........I think it would be nicer to repeat levels.
Actually I don´t pay toooo much attention anymore to the game and whatever in 2 or 3 years might coming DLC.