The available MODS are good for eye candy, but the meat of the sim are how the missions are played out. So, I would encourage anyone to spend a little time to learn how to edit mission files with the mission editor as well as manual editing of the xml file.
Spending some time to choose your wingmates, patrol route, altitude in the mission editor makes a big difference. Manually editing altitudes and aircraft formations of recon/bombing (enemy and friendly) flights is also very nice.
WOFF's theatre of operations where you can encounter flights is a bit small, so there's also the possibility to expand it and add more flights.... and that's just the tip of the iceberg.
just my two cents...