I've been playing this with my 6 year old son for a little while now and we both love it. He also loves the Company of Heroes games
Bolt Action is definitely worth getting into, and some of the army packs are good value. We normally don't play more than 1000pt games on a 6 x 4 board, so you don't need to buy a massive amount of troops. Although the more variety you buy the more choices you can make.
i love the game mechanics, although they can be a little light ie not that much variety due to the simplistic nature, although this means you can concentrate more on the tactics than leafing through the rulebook. The random turn element is what reallyy drew me in though. Instead of the usual "I move all my troops then you move all yours" approach, you draw a die from a bag to determine the next move. So if I had 10 regular squads and my son had 5 veteran squads, there'd be a pool of 15 dice in the bag. One die is drawn at a time, so I'd obviously have a greater chance of selecting on of mine. I can then acivate any unit I like. The number of times where my son drew 4 dice in a row can really
**** up your game plan
There's a really good introductory game video on Beasts Of War. It's two parts, an hour for each but the time flew by while I watched it and was hooked immediately.
https://www.youtube.com/watch?v=qZXabaKnarg
Oh, and we have US and German forces and I think they're pretty evenly matched. The US move and fire rules are great, but the Germans get a great HMG rule, so it's best to take advantage of the individual nations advantages.