I really really like this guide.
I agree with KeinMcnyaa. There's a lot of angles that are pretty much community knowledge in the game for every instance. I'm sure the DDTank GSs (including me) could explain all of them but another thing I like about this guide is the simplicity of it (as in no over-explaining). It gives new players knowledge on exactly what to do on each stage in one condense guide.
Precise Angles:
Ant cave
Stage one: No real precise angles on this stage. Only advice would be to aim high 40°+.
Stage two: If you're in the back, 23° and 100 power is direct hit to ant queen. If you're in the front, then 46° and 55 power hits the ant queen.
Gulu Kingdom:
Stage one (all): Only angles I can think of is AFTER you fly forward to front of the ship, use 60° and about 15 power to hit the gulu directly in front of you.
Stage two (all): If you're in the back... to hit Barok at the top, use 40° 50 power, bottom is 20° 45 power. If you''re in the front... use 50° 45 power to hit Barok at the top (Important note: if there's heavy wind towards barok then increase the angle accordingly), bottom is 20° 40 power.
Stage three (Normal, Hard. Stage four in heroic is the same): If you're in the back, use 30° 45 power when shields are down. 70° 55 power when shields are up (adjust to wind accordingly). Front is nearly the same, 30° 40 power when shields are down, 70° and 45 power when shields are up (again, adjust with wind). When the shields are up: If the wind is against you, then you need more power. If the wind is with you, then use less power. You don't have to change angle.
Stage three (Heroic): No precise angles, simply land on the stages with the keys. Aim high and watch for the wind.
Stage four (Hard, same for stage five in heroic): Everyone move to the platform of the second character (except for tank), use 41° 45 power to hit Mardicus on the top of the head for most damage. This is also exactly where you need to hit for ice. Stage 5 is Shadow Mardicus instead of just Mardicus but same basic angles apply.
Shadow Castle:
Stage one: Move to the top of the ledge and set your angle at zero. To hit barrel: First stop = 0°, 35 power. Second stop = 0°, 65 power.
Dragon Zone:
Stage two: Middle stage: To hit the goblin in the front, use 30° 45 power. To hit the guy at the top, use 45° 60 power. 45° and 50 power for the middle goblin. Watch the wind! (EDIT: Tested today

)
Stage three: This is pretty much aim and shoot, but to free the player from the 16 ton weight every time, use 32° 65 power (middle of stage).
Stage four: Aim for the eye of the dragon. For back of stage (furthest from dragon), use 45° 55 power. Middle stage = 45° 50 power. Front = 50° 50 power. The ice wall can be hit easy by using 45° 25 power from middle of the stage (where most players go).
Gulu Olympics:
Stage three: I don't know the specific angle for hitting the referee, but I know it's in the 50-60 range. Anyone know? :O (EDIT: there's a wide range of angles that work. 50 angle 60 power is about the median though)