You'll probably want to rethink that once you've tried a few Challenges or been in the DZ for a length of time. Health seems to have very little tangible benefit - I stacked HP and Armour to the point where my hp was over 90k -- still die just as quick as folk with 40k hp with the exception that my damage was terrible by comparison
Because of the way the game works, you'll find things like Shotguns are entirely useless for high end play - since you have to be close to them to do any damage, but they melt you far too quickly for you to get close. Likewise with HP, they do so much damage that you die in 2-3 hits regardless of what you stack - so it's actually better to go for damage to kill them quicker so you're in combat for less time. The best defence is certainly a good offence in this case.
I'm not sure how, or if, they're going to go about fixing this. A lot of the mechanics in game become entirely pointless on the toughest enemies.
Examples:
Turrets are almost entirely useless as they die in 1-2 hits, do virtually zero damage, and unless you use the shock turret they have no support value.
Shotguns, as mentioned above, don't do enough damage to kill the uber bullet sponges (level 32 elites) in any practicable time - leaving you vulnerable and guaranteed to be dead.
Explosives do ZERO damage, makes grenades useless aside from for status effects -- they're more of a supporting role than damage dealing. This also makes all of the seeker mine and sticky bombs useless, again with the exception of status inducing mods.
Mobile cover (and presumably shield, though I've not tested that) goes down so quickly it's virtually pointless.
This leaves you with the Medical list of skills, and Smart Cover in the Security list. I would HIGHLY recommend someone in your group have smart cover, the dps increase and damage resistance is a huge benefit for everyone.
As for player "Roles" - Tanks are entirely useless, due to the things mentioned above. Damage evasion on 32 elites is the only option (by that I mean making sure the bullets don't hit you) - there's no real way to mitigate their insane damage.
Sniper *can* be useful - but they essentially have to do the same as everyone else and just empty clip after clip into people's heads.
Shotgunners - As mentioned above, shotguns don't work high level.
Tech guys - Again, I've covered most of this above but essentially your tech will never do enough damage to be considered useful, even if your turret doesn't immediately die.
Medic is a REQUIREMENT! There's no way around it.
Assault - AR, SMG, LMG, Marksman Rifle -- whatever weapon you pick. Just stay behind cover and let the rounds go.
Maybe PVP will change the realm of what's useful if/when they fix DZ to make PVP a viable choice (or bring in something entirely different). Who knows.