Last year I played my 1st game of Advanced Squad Leader for about 30 years and although I quite enjoyed it (we played a very simplified introduction game which didn't come with the dissertation level rule book) I found it less satisfying than some other WW2 boardgames such as Heroes of Normandie...probably still my favourite boardgame in this setting.
Last week I had the chance to try out an alternative to ASL...Lock 'n Load Tactical. There are lots of games in this series (including confusingly a Heroes of Normandy set...but spelled with a 'y' at the end rather than an 'ie'!). We played a scenario from the introductory game: this is a relatively cheap starter game which gives players a chance to try out the mechanics in a couple of scenarios before committing to investing the system which is quite a nice idea. As this can be picked up for less than a tenner it's pretty good value. We played out the WW2 scenario but the game also includes a Vietnam scenario which would be good to try at some point.
Well worth checking out, especially at the cheap price. There are lots of additional games in the Lock 'n Load series including assorted WW2 theatres, Vietnam, Modern etc...I'm not sure whether it retains the relative simplicity as it grows into the full version but worth having keeping an eye out for.