How I'd balance things...I'm too tired to explain the reasoning right now. Competent players will understand. If not, leave a question or comment.

• Drop max crit chance to 50%
• Change crit modifier to 150% (currently 200% or +100%)
• Remove passive from Rage
• Drop Executioner's reduction and % from 6/8% to 3/4% OR increase the price to 2700g
• Reduce the price of Qin Sais to 2650
• Drop atk speed gain from Ninja Tabi to 10%
• Add 150 mana to Bluestone Pendant and remove the passive
• Make Heartseeker lose ALL stacks upon death, but increase the stacks per god-kill to 5 to match other stacking items
• Remove physical power gain and steal from Ichaival.
• Drop the price of Devo Gloves to 1840g. Make them 80 stacks that give them a max of 50 power and 20% lifesteal.
• Reduce the attack speed of Asi to 20%
• Increase base health and protections of all guardians by 10%
• Increase CC length of all guardians by 25% at max rank
• Lower base damage of all guardians by 60

I think these changes would put hunters and guardians in line with other classes.

• Physicals could still crit 500-600 against squishy targets, but take longer to come on line, are no longer guaranteed crits, and won't have the attack speed and shred needed to box a tank/beefy warrior
• Guardians no longer get ripped to pieces by physicals unless ganged up on and they have CC that lasts a tad longer at max rank, but they do significantly less damage.

Example of Athena before and after proposed changes:

Currently:

• Preemptive strike does 80/130/180/230/280 + 50% + 25% slow
• Confound lasts 1.0/1.25/1.5/1.75/2.0s
• Shield Wall does 140/245/350/455/560 + 100% (both strikes)
• Defender of Olympus does 750 + 90%
• Level 20 health is 2500
• Level 20 Phys. Def. is 84
• Level 20 Magical Def. 48

After changes:

• Preemptive strike would do 40/65/90/115/140 + 50% + 30%
• Confound would last 1.0/1.25/1.5/1.75/2.5s
• Shield Wall would do 70/125/175/230/280 + 100% (both strikes)
• Defender of Olympus would do 375 + 90%
• Level 20 health would increase to 2750
• Level 20 Phys. Def. would increase to 92
• Level 20 Magical Def. 53