I may just get this game... Cliffs of Dover was such a disappointment :\.
I would suggest to carefully consider what disappointed you about CoD. Was it the gameplay experience, or lack of it? In that case, BoBII 2.12 could fill that gap because what it has in spades, is depth of gameplay - the AI, the campaign, the immersion factor.
But if CoD disappointed because it wouldn't run on your rig without graphic hiccups, and you hoped for something more photorealistic in a sim from 2012, then BoBII won't deliver because one thing the BDG can't achieve miracles with is the BoBII look and feel. It is what it is...and always will be because the gfx quality reflects its age.
I think the best way to explain is thus. I have both sims on my gaming machine.
I use CoD for the occasional online game (I do a bit of boom and zoom and swat a couple of unsuspecting Spits in my 109 until I lose height, lose the fight, or buzz through the ATAG server in a Heinkel or Ju88, surprise someone who thinks they are in for an easy kill by pulling my special Heinkill(R)Hammerhead manoeuvre and swatting them with one of my MG15s, get shot down shortly thereafter and then go kick the dog.) Or I spend a few hours designing and testing a new offline mission, put it online, and then write up an AAR or two. I love the gfx, I love the full mission builder, I love the spontaneity of the online game. I love the whole land war, air war, real sim feeling of being there that only CoD can give. Want to get that 'real cockpit, flying a 109, while the war rages outside' feeling?
CoD. (And the Operation Sealion mission pack, of course!)
I use BoBII when I want a serious
dogfight. I set up a 9 vs 9 quick mission in BOBII and spend the next 20 minutes fighting to the death against the best PC dogfighting AI ever created. Or (mostly during those long Nordic winters) I start a campaign, pick one of my favourite units (JG 26 or 54 Sq) and play dead is dead, seeing how many missions I can stay alive before some random AI swine with a lucky shot (of course, never my own poor awareness) kills me dead. In literally hundreds of campaigns, I have won a couple of dozen, beat the Brits in a world record (for me) 12 days, and been deaded the other 80 times and each time, I love it. You want to know what it was like to be 'one of the few' climbing out of Manston in your Hurricane IIb on full boost with a 100+ raid coming down on you like the hammer of Thor?
So it is horses for courses.