Attack Fighter Exploit 1
At-will Standard Action - Weapon
Target - One Creature
Attack: Strength vs. Armor Class
Hit: [W] + Strength
Burning Hands Wizard Spell 1
Daily(Vancian Magic) - Arcane Close Blast 3
Target - All creatures in Close Blast 3
Attack: Opponent's Reflex Defense - 10 vs. 10 + [Intelligence Mod]
Hit: 1d4/level
Miss: Half - Damage
So, there are two 3rd edition 'powers' in 4th edition form. Looks like the only difference, seeing as how both are just doing damage, is in who rolls the dice. So, 4th edition is changing whose hand the dice goes in when rolling to see if a spell hits. Using this same format, attacker rolls, defender has a static amount, for all combat is a good thing. The other thing that changes is a mindset. In 3rd, fighters have their attacks and feats, wizards have spells, completely different chapters, even if they are doing the same thing: damage. By the same thinking some of us use now, we could call each fighter attack a spell, as well as each combat maneuver (Bull Rush, Grapple, etc) spells. Oh, and breaking down a door can be a utility spell.
As far as melee classes using crazy exploits; yes, welcome to 4th edition. Explain it however you want to in your game, magic, chi, or just amazing feats, but the principle is here to stay. In my opinion, none of the melee powers I've seen so far are completely unbelievable, but I await any extreme examples to consider.