Whatever has the end of development of a non-combat sim got to do with combat flight sims?
Because the MS combat flight sims were built around the MS Flight Sim engines. Apart from the IL2 mods and some 'in development' games there isn't anything out there that is overly engaging.
Without a release date the games and addons you've mentioned aren't worth the code they're written in - excuse the cynic in me but I have seen many a game that I've been interested in fall by the wayside.
Lock on is a nightmare - it's painfully unnaccessable and a nightmare to learn how to use. The unfortunate fact is that there is no real decent modern fun flight simulators out there and with the end of development from Microsoft on FSX I don't believe there will be a decent combat flightsim in a long while... I could be wrong tho...
SoW:BoB (WWII)
What's this? I'm assuming BoB is Battle of Britain, love sims based around this.
A nightmare? Lock On? You must be playing a different Sim mate, Lock on can be set to be as easy or difficult as you like, there are dozens of options for realism/arcade modes. There are tons of Sims on the way too as Dano pointed out.
To the OP download the Lock on demo and make up your own mind - Near the bottom of the page... http://lockon.co.uk/index.php?end_pos=135&scr=products&lang=en ) A very good user made vid from lock on - http://www.youtube.com/watch?v=CCJKS_9TQfM
Other Sims to check out are IL2 1946 for WW2 air combat, Falcon 4 too is excellent, but it's a bit on the heavy side in terms of complexity. There is also DCS:- Black shark for Helicopter combat. For Vietnam era combat Strike Fighters 2 would be worth a look. Edit:- I forgot for WW1 flying Rise of Flight is on its way too.
A good site to start with is www.simhq.com lots of info there.
Nate
Deadly video! Lock On looks good. Arcade mode could be what I'm looking for, I don't want a realistic flight sim (could never get the hang of landing) just flying around blowing things up, basically.
Like Top Gun.