Ummm, Nail...the mission matching seems a little...extreme. I ran a patrol (don't know which, sorry, it just said Patrol) in a CC, had a C-SAL2 (whatever that is) for AI help and had not one but two H-REG dn's to fight! Something seems a little off. Just thought I'd let ya know.
In ED missions this happens. EEK has better control over the class ship you encounter than does ED. There are more ED than EEK, but EEK show more. So I guess you have a pretty even chance of drawing either. IIRC, EEK wont give you DN's unless you are in one and matches other classes appropriately.. Although CARRIER class may not be differentiated from DN, and in actuality, the shiplist shoul class all DN's as DREADNOUGHT instead of using other hull types. I'll look into it. Its a scripting-shiplist interaction thingamajiggy.
Imo, it is 'expected' that we win every engagement. With the mission packs we have it is not always a sure thing. I'd say 90% of the time you should win. 10% of the time you may not... Can you deal?