Exploits aside, and I do consider being able to learn other classes spells a exploit. A wizard just simply cannot compete with the other classes. Keep in mind I havent been trying to exploit the system, but to play a wizard as it's set up in D&D rules. A wizard with 18 strength can do more damage with a staff then a wizard with 18 intelligence can do using it's cantrips.....That's just not right.
Now unless it's expected that we rest a wizard after every fight. 1st and 2nd level spells (What we have access to so far anyways) are extremely limited. And shouldn't hurling a ball of fire (Even the cantrip) be every bit as deadly as a arrow shot from a longbow? It's not.
A wizard strictly by dnd rules is the utility caster vs the Sorcerer which is the battle caster. The sorcerer because of things like twinspell ect is the ideal aoe damage dealer hitting large numbers of enemies for above average damage but the fighter / barbarian up close with the 2 handed sword typically does the most damage on a target. I mean even if your a wizard a ball of fire on yourself doesnt really benefit you. Same time the archer could fire a bow typically faster than you could cast the words for a spell and if it hits your heart you would be just as dead IRL as if you lobbed a ball of flame which doesnt necessarily kill the target. It explodes catches everything on fire but even irl you can survive a moltive cocktail being throw at you more so than a bullet through the chest with accuracy. Thats applying logic to both people have survived being struck by lightning same regard more frequently than being shot in the heart with a bullet. I have an uncle that actually survived being struck by a lightning bolt. So i mean you do the math theoretical math the odds do make sense. It also does make sense to kill the damage over the tank. I mean when I play games I will generally kill the squishiest target first or the healer.
