Sorry, but training aside, SPARTAN-II's are considerably faster and stronger than normal humans. Wrist rockets can be dodged, lasers avoided pre-preemptively. Plus, Mark--VI SPARTAN armor can take sustained plasma fire for several seconds, and recharges fairly quickly.
Even if you don't give the Chief a power weapon like a energy sword, rockets, or spartan laser, he's still lethal. Give him a Battle Rifle, Sniper, 2 frags, 2 plasmas, and a piece of equipment, such as a bubble or regenerator, and Fett would get mowed down in an open battle.
Even if this was when Fett had beskar'gam and a jetpack, he wouldn't "destroy" MC.
Then we go to training. MC has been in either intense military training or war from the age of 6 to the age of 50+. While Boba has been fighting for a while, its never really against someone of high caliber or numbers. Both Elites and Brutes are very worth adversaries, stronger than Spartans and better armed too. Boba was taking down mercenaries and thugs. I say MC is better trained for a drawn out fight.
And if they get close up, MC is ridiculously strong.