The difficulty is insane in some missions. I've only played through the 8 first Allied missions this far, and I had to replay some of the missions around 10 times, on easy difficulty!!
I'm not a noob in any way either, been playing all Red Alert games for 16 years. Mental Omega 2 was definitely easier than this. You've made the AI more challenging which is good, but the missions seem to have been designed by different people, some of them were badly designed, others very great but too difficult.
Some of the voices for the units were very annoying, example that German guy talking for one of the Allied tanks. You really notice it when you select multiple units of different kind, having all those units say different things in more than one word at the same time is just not good.