Britain’s NAs aren’t useless, but 3 of the 6 are one-time-use. Once you trigger 'em, they’re gone. That puts a little tension on the UK player to make the correct choice about when to use them, and also means that have relatively fewer advantages once they do. In general, Britain’s NAs are meh.
Mideast Oil - I like this one, because it allows surprise defensive appearances by Fighters halfway across the world. Bombers get unbelievable reach. You can take off from London, bomb Moscow, refuel in Persia, and land in Australia all in one turn.
Colonial Garrison. A double-edged sword. You can put down a complex, but it could get gobbled up and used against you if you don’t devote a lot of resources to protect it. I would prefer this NA if it were a free Complex one time during the game, not necessarily at game start.
Radar. Useful, if there were any British territories with an AA that regularly got attacked by Axis air.
French Resistance. Three lousy infantry. Egh. That should slightly slow down the German retake.
Joint Strike. I have yet to plan and execute a proper D-day using this. I’m sure it will be a fantastic moment when I do.
Enigma Decoded. My favourite of UK’s NAs. I love setting traps for poor sucker Germany. Once you’ve used it to devastating effect, it takes on a good psychological value in future games, too. A flotilla of undefended transports won’t get attacked by German air, because I have a few combat-ships next door and Enigma Decoded in my pocket.
Germany, on the other hand, is all action all the time, and becomes a combat beast when all 6 are turned on. Fortress Europe and Atlantic Wall together mean that _every single German unit defending against amphibious assaults in grey territories defends at 3 or better._ Not too shabby. Luftwaffe Divebombers and Panzerblitz together means that first-cycle massacres are the norm, and that expensive German equipment doesn’t remain in range of a counterattack. U-Boat Interdiction and Wolfpacks are not ideal, since subs are not such a mainstream purchase for Germany, but when they’re active, you’ll find the Allied player quite concerned with their effects.