You make it sound so good 
Its just not how i feel when playing haha.
I have a little out of the box combat mage with an smg gun something something.
I have 5 force/magic
12 dice to cast my spells.
9 dice to resist DV
13 dice to shoot my gun. and have a vent on it that lower the recoil by 3.
So lets say i cast a powerbolt at my standard force 5. it has 3 DV if i remember right.
I rolled with 5 net hits. that give me a DV of 8... i fails the resist and got stun and killed?
Never ever had a chance to fight or do anything?
That even make what to shoot my gun next time...
Im not sure here maybe we got it wrong.
But you can do a complet action or 2 simple in your turn right?
Shooting a gun is a simple? So that allows you to shoot to times right? Making guns even better?
Why do you only have 9 dice to resist drain? You should be rolling Willpower + Charisma or Logic. One of those should be at 6, the other at 5. Did you actually put a 3 in one of your drain stats? That's just bad character building.
You can also get more drain dice by using a Fetish for your spells, which gives you +2 to the roll, but you can't cast the spell at all if you don't have your Fetish on you. I believe they cost 200 in 4th edition.
If you got 5 net hits, the other guy is outright dead. 10P with no chance to soak damage. You then have to deal with 8 Stun damage, and with only 9 dice, you probably would take some drain. But it wouldn't even knock you out, let alone kill you, since your minimum stun track would be 10, even if you dumped Willpower for some insane reason. You could get 0 hits on that roll and would still be standing. Then you could just grab a medkit and heal some of the stun you just took, and take an hour nap to heal the rest, and be fine.
And if they actually errata'd the +1 Drain per net hit thing like ZeConster said, then it's even more ridiculous. 10P for 3 drain, which you should soak easily even with 9 dice.
And that +1 drain rule only applies to Direct Combat spells, not all spells. Indirect Combat Spells do not increase drain with net hits, nor do other categories of spells, like Manipulation. So your earlier example of killing yourself by casting Armor was also very wrong.
It's also worth noting that you take drain AFTER your spell takes effect, not before. So even if you do cast a ridiculous Force 10 powerball with 10 net hits, you'd nuke the city block first, murdering everyone within line of sight inside, and THEN you'd have to soak the 15P drain. You'd probably die, but they'd die first.