Hi,
As a DM of a rogue trader group which is mostly rank 5 or 6, I am starting to run into a particular problem during personal combat (and, to a lesser degree, vehicle combat), that is the stacking of near-unreducable defensive abilities.
What I am talking about is Dodge 90 (Agility 45 during creation, 3 increases, Dodge + 20 and talented:dodge) plus a conversion field (and it could still get worse ....) with 2 or even 3 reactions (though just 2 of them may be dodges).
Now, the problem is not that I cannot hurt the players, since you can solve most of that by just throwing multiple opponents at them, or hosing them down with heavy bolters and such, but...... the combat has now turned into a Save-vs.-Death Roll business. Basically, the chance of a single hit to get through these layers of defensive rolls (and re-rolls with fate pts) is below 3%. However, in the case of those 3%, the character still has armor 5-6, TB 5, which requires me to give the NPCs pretty solid weapons, otherwise they just wont ever do anything to that character.
Which then leads to the big issue: 97% of the time, nothing happens at all. 3% of the time, the character is possibly killed outright or at the very least in the high critical ranges. If I pack smaller weapons, the player doesnt care at all (lasguns, autoguns, even with proper ammo, just dont scratch them), and if I pack the big ones, I run into the problem of a) looking a bit weird with random grunts packing meltas and b) one-shotting players just on a matter of pure chance.
IMO, power fields are not done very well in the system (too much copying of the tabletop idea with the saving rolls), and attackers dont have enough ways to circumvent Dodge, or at least make the check harder, outside of full-auto.
Maybe I am missing something, but it really has turned combat into a "hope he doesnt get lucky" situation, where most of the time nothing happens at all, and sometimes someone just falls over.