I decided to watch this again with an eye to assessing the powers of the characters in the series.
Starts with Iron Man destroying a gargantuan robot. Comparing Iron Man to the robot's head when he catches it, the head appears to be about 45' high, and the robot is about 7 heads high giving us a total height of 315'. It's hard to assess this because we don't know how Iron Man destroys the robot, but catching the head can give us an idea of his strength.
An average adult male human head is about 9.4" high * 8.5" deep * 6.5" wide. The robot's head is about 57.5 times as big along linear dimensions giving it roughly a volume of about 1620 cubic meters. Steel weighs 7874 kg per cubic meter so, if the robot's head was a solid block it would weigh 12,755,880 kg or 14,061 tons. Of course the robot's head isn't a solid block. For argument's sake we'll say the head is only 1/3 the weight of a block of steel. That's about 3500 tons that Iron Man catches while flying.
Iron Man's uni-beam disables the Hydra-mech after several seconds. We don't know how thick the mech's armor is but let's assume for a moment that it's equivalent to the armor belt of an Iowa-class battleship. That would be 12" of steel and Iron Man would need to generate more power than a 16" battleship gun to pierce it. Burning an 8" circular hole through 12" armor means vaporizing about 78 kg of steel. The best estimate I could find on line for vaporizing solid steel was 1964500 Joules/kg. That suggests the unibeam can generate at least 152.9 megaJoules of energy.
We should assume a slightly higher output because the beam not only cuts through the armor but also damages something inside the mech (the power generator?) enough to cause a disabling explosion. At a guess, let's call it 160 mJ.
Putting out this energy lasts 6 seconds and drops Iron Man's power level to 40%. This suggests the output is 26.67 megawatts and that he could maintain this output for a total of 10 seconds. It also means that his total power would be 267 megaJoules.
In the episode "The Fall of Asgard" Iron Man knocks out Ulik the Troll by releasing his full power in a uni-beam burst of approximately 1.5 sec. That's roughly equivalent to a 127 lbs of TNT or 15% of a typical lightning bolt, which seems much too low. I have probably underestimated the strength of the Hydra-mech armor and will have to see what further information subsequent episodes yield.
I should also note that in this world, the Grim Reaper is able to parry bullets (SHIELD blasters anyway) with his blade.