There is nothing easy about the 109K-4, except that it gets a player where they want to go in one of the quickest ways possible in AH. It is one of the better interceptors in the game. It is not, however, a air superiority fighter, or even a dog fighters per say. It is an interceptor. Sure, there are some players who know the torque and acceleration abilities and how to harness it, but in general it is NOT an easy mode plane.
The best examples of "easy mode" planes are as follows: Spitfire Mk XVI (Spit16), La7, and NiK2. The P51D can also be considered as such for the most part, but the learning curve is very short almost to the point of not worth mentioning. The Spit16, La7, and George are truly "get in and fly and dominate" planes, and shame on any "vet" who takes them in to the virtual skies. 
It can escape from the vast majority of the planeset simply by going up, and has excellent acceleration over most of the set. I can't disagree with you on your 'true easy mode' planes, but the K4 simply isn't that far behind them in terms of ease of use other than gunnery, which IMO is huge.
I think there's an additional category that's worth mentioning when it comes to planes like the K4. To me, they're the ones that take some getting used to, but if you put the time in they have a lot to offer either in their limited type of fight, or in general once you become familiar with them.
A two weeker's not going to jump into them and be a killer, but once you've got your head wrapped around them, they're possible and fairly easy to do well in.
I'm thinking planes like the 109K4, 190D9, the P47D-11/M/N. Put a two weeker in any of them, they're not going to do much. Put in an average dweeb who's been around for 6 months to a year, and if he puts in the time to get comfortable with them, he can use them effectively against pilots of equal or lesser skill.
Then there's the stuff that is actually somewhat difficult to prevail with in the MA's like the P40s, early 109s, etc...
Wiley.
