I'm on my first play-through as a pure mage and I am almost giving up on this game. I have a tremendous trouble killing enemies, one example is the dwarven sphere. I find myself hiding behind my flame atronach 100% of the time and even then just one of them is not enough to kill a dwarven sphere. Right now I am stuck at the one quest because I cannot handle two Falmers at once. It's one mage and one archer. The mage uses ice so my flame atronach is [censored]. And it takes 4 hits for my mage to die from any meele/arrow attack so yea.
Magic svcks in this game, hard.
Ah, here we are, another ignorant complainer, there's so many of these that continue to plague these forums. But don't worry, it's not your fault. I had the same trouble,
but I didn't give up. If you were like me then you probably thought to yourself "To hell with the Companions, I'm going straight to Winterhold," to tackle on the college quests. #1 mistake right here. I had the same trouble you did, when you are tasked with ascertaining the location of the staff of magnus by going to Mzulft, I too had trouble taking on multiple Falmer, Chaurus and single Dwarven Sphere Guardians. I would assume you're talking about the Mage questline(or some questline), because otherwise you weren't strong enough to beat and you're just being extremely stubborn. My advice, don't take on the College of Winterhold questline until you've reached atleast level 15. I found alot more success with this after resetting my Pure Mage character. Other than this I(and you should) got my enchanting up to 60 at an early level and created very useful enchantments that fortified the cost of my Destruction spells. In addition, I like to play more of a Conjurer's role at higher levels(+25) but I like to use mainly Destruction from the get-go, so I boost my Conjuration respectively with my level: 50 at 15, 65 at 20, 75 at 25 and 90 at 30. The rest I bring up myself, but at that point conjuring Atronachs doesn't boost Conjuration too much.
Alternatively , If you play on PC, there is a mod that makes Destruction Magic scale and increases Magica regeneration when fighting enemies. Magic is far from svcky. Sure it could use a buff, but I wouldn't dare call it underpowered.