Yeeeah, that's exactly the reason why I rerolled my character. First time round - was a mage, meant to be a heavy armour-wearing battlemage that relies on desctruction spellls.. Haha, yeah right. Like an electric bunny running on sour pickle instead of a battery Had to change to conjuration and just sit in a corner / run around frantically trying not to get hit while letting the summons do the killing, the action and the fun. Exciting gameplay it was not

Got up to level 34 with it, and the further I got, the worse it became, basically. Wasn't that hard to take down dragons though - I conjured atronachs, then conjured a bound bow and shot at the dragon piddling away healthbars. A blood dragon, all in all, took.. idk, some 30 arrows or so?
Now am a lvl32 dual-weilder, light armour class, with nothing in enchanting but 100 in smithing. Light armour, with armour rating at 598. One sword does 75 damage (+25frost dmg enchant), and the dagger - 54. A blood dragon, an elder dragon go down in
literally 3 dual-weilding power-strikes. So I just wait for a little bit while the dragon lands - no need to even shoot an arrow, and within 5-6 seconds he is dead. I don't know about you, but my mage could not do anything remotely like that. Now factor in that I can have a paralyze on my swords, I could have calm, or fear, or frenzy (on bows and such) - so I
can do crowd control if I choose to do so. Difference being, I don't get two-shotted by anything, and I can do damage myself as well, without having to rely on a conjured npc to do all the actual fighting.
Bottom line - yes, maybe the magic can get adequate on its own, if you really make the right build and equips. However, on a total final viability it still falls short of melee, and there is far, FAR more effort for less gain.