ASL is great. The Greatest WWII tactical game (that I've played), like Mark and Paul said.
Don't take everything in ASL literally, though; there was a 'skulking' thread months ago[started 10 March, 2004]. Basically, the skulk represents the tactic of keeping your heads down, not reacting to your enemy's movement. The troops that skulk aren't "really" changing Location/hexes, they're maintaining concealment throughout a certain length of time - an abstracted 2-4 minutes. . . You'll find some here that think even this explanation is too much 'realism'. Also, there are many other examples of this, too. LOS can be quite abstracted, for example. Just don't take it too literally.
Once you learn the whole system better (not sure if anyone, ever, learns it completely. . .) just integrate all the rules and 'real tactics' will work more times than not; at least they're an important aspect of good play. See the 'Lawyers vs. Tacticians' thread here, as well.
It's really a personal choice thing. We all find it worth the effort to learn the rules. We find it fun and it fills some need/meets our interests. Realism isn't necessarily my 'thing' so it's hard for anyone else to answer your question. Yes, ASL's realistic, to a certain extent. Do you find re-enacting a realistic experience of army life/combat? It's more realistic than ASL but not like joining the army!
My guess is that if you've played a couple SK scenarios and haven't given up yet, you'll end up liking it and getting hooked.
Alan