I upgraded to 2.7 to check out the new ERs and you are right they do seem significantly more lethal.
I've been running through the Persian Gulf 4v4 mission (15C with AMRAAM vs Flankers) multiple times attempting to beat it. It must have been designed since before the 120C was added since I've found it almost impossible to beat. (I can beat the 2v2 almost with my eyes closed.
For fun, I took the mission and swapped the SU27 out for the SU35S, and loaded my flight up with 2x R37 and 4x R77M just too see if ordinance made a difference, and I beat it almost without trying.
Being the first one able to fire a missile and force your opponent defensive seems probably the most important part of BVR combat.
Even so, I think I'm going to stick with the Flanker. It seems to me to be the perfect platform to force you to learn good tactics, because that's the only way to succeed with it