Please no.
The game is very much fine. There are easy missions, which are easy, and probably win themselves pretty much without player interaction. And there are harder missions, which are hard. Some of them are so hard that i have not yet beaten them. But i am absolutely fine with that. Not everyone should be able to beat every fight very quickly. If that were the case, you could as well just watch a movie. I think that if a mission is called hard, it should be hard, not average.
I think one of the main things ruining good games is developers listening too much to the people whining about how the game is too hard. Games can be too hard, but people have to realize that they also can be too easy. I might be in the minority here, but i think that developers should be very careful when they listen to the community, because very often large parts of the community don't really know what they should want. A prime example of that would be WoW, which in my opinion got pretty ruined by too much listening to whiny people.
Edit: Also, to add something useful, you were talking about coral nebula. As you see, you are flying a large carrier, have lots of fighter craft, and fight a mostly capital fleet. Thus, you goals should be quite obvious. Take out all of the enemy fighters and bombers by deploying your interceptors first, and take some battlefield targets, preferably the nav buoys. The, just stay away from the enemy capital ships with the carrier, while your torpedo bombers, which you deploy next, do their magic. As long as the group returns to your carrier, it does not matter how many ships it has lost, it will rearm and reattack at full strengths. Their capitals will never be able to shoot down whole wings of your bombers, and will be destroyed very fast.
Note that this mission is marked as hard, and as such should be expected to be hard. Otherwise, why would it say so?
And fighters are very much not a joke. Bombers and Torpedo Bombers are a very dangerous threat to any capital or medium-sized ship. Very, very dangerous. If i am not mistaken, those dagger wings sport reaper launchers. Those things hurt like hell. If you ever want to blow a capital ship up in three hits, use a reaper launcher. Also, shooting them down with point defense weapons is hard when they have carrier support, and thus interceptors wings like Wasps are useful to kill them off. I am not quite sure what to think about the heavy fighters and support fighters, i think they are mostly there to combat frigates and medium-sized ships. I am not really a fan of those, i find wasps and bombers both far more useful.