But the objectives are actually just that for the most part. 'Break through the fuckhueg ork mob and cap victory hexes' or 'hold these victory hexes plz'. There are only a handful of missions that are a bit more varied, and for the most part they are the coolest - one definite highlight is the mission where you have to protect like 10 or so victory hexes and keep at least a half of them intact to win, with them disappearing for good if they are capped by the enemy for 2 turns.
What bugged me the most about the missions and maps in combination with the boring objectives was the lack of side goals or something. All the maps are huge for no good reason whatsoever, you usually won't even uncover half of them, and for some bizarre reason the areas that you will never check are populated to the brim with orks. There are no artefact sites, recruitment centres or xp/money drops to be had here like in Rites of War or Fantasy General, and that is seriously bad. You also don't get any flexibility or rewards when it comes to masterful tactics and turning retreats into siege breakers which bothered me a lot in that one mission in the first campaign where you have to hold a line of hexes from orks crossing through from a jungle through a river. Then you have to retreat from said hexes to another line of hexes, and finally evacuate to the other side of the map - I had to do all that even though I kept the ork hordes in check at the first river and was even about to cross into the jungle and cap their bases.
Space Marines don't need nerfing because they are terrible already. There is barely any reason to use SM units over IG - particularly vehicles. Death Companies/Sanguinary Guard are useful as fast infantry for getting rid of stragglers or capping and Furioso Dreads are very good all around, but that's basically it. Land raiders are terrible and so are preds, there is no reason at all to use them instead of shadowswords. Aircraft are inferior to IG gunships, scout vehicles are about comparable with chimeras, iirc land speeders are ok for scouting and fire support, and that's it. SM artillery is terrible. Scout snipers are so-so but you're likely to have high level ratlings at the point you get them anyway.
As for super heavies, they don't need 'nerfing' per se, the game just needs AI that isn't idiotic. You know something is wrong when you can just drive a shadowsword into one chokepoint hex and stop the entire ork army from advancing because the retarded AI won't even bother attacking the tank.