Dont worry, the arcade game is two player, another thing I liked about the arcade game is that you have to press y to simulate inserting a coin.
I think its just a matter of rythum, you need good rythum to do well in ninja gaiden, learn some moves and then learn how to link them together, another factor is bluffing, this might sound weird but the majority of the bosses in the game bluff their strength, for example, the first boss seems hard but you could easily win by ignoring him and taking out all the ninpo enemies first, just hold block all the time so if the boss comes near you you take little to no damage then when one the enemies gets close doge and wail on him, with them dead take out the boss with arrows and he goes down like a b***h. With that method I won the fight in about 2 minutes.
Also the tank bosses in the military compund and no where near as tough as they look, just wail on it as soon as the fight starts with the aspcd cores if the cannon fires dodge it then fire more arrows it goes down in about 8 arrows about 20 seconds for me, then do the same with the second tank. Dont worry about taking some machine gun hits it doesnt really do much damage. Also you dont need to percisoin aim since ryu auto aims when you fire the arrows.
Same for the viggor emperor, move around to dodge the beams and use inferno on him about six times then on his next form just use your flail to destroy the skulls dodge his head and fire arrows at his head until the skulls come at you, the whole fight shouldnt take more than 3 minutes.
I think its just a matter of rythum, you need good rythum to do well in ninja gaiden, learn some moves and then learn how to link them together, another factor is bluffing, this might sound weird but the majority of the bosses in the game bluff their strength, for example, the first boss seems hard but you could easily win by ignoring him and taking out all the ninpo enemies first, just hold block all the time so if the boss comes near you you take little to no damage then when one the enemies gets close doge and wail on him, with them dead take out the boss with arrows and he goes down like a b***h. With that method I won the fight in about 2 minutes.
Also the tank bosses in the military compund and no where near as tough as they look, just wail on it as soon as the fight starts with the aspcd cores if the cannon fires dodge it then fire more arrows it goes down in about 8 arrows about 20 seconds for me, then do the same with the second tank. Dont worry about taking some machine gun hits it doesnt really do much damage. Also you dont need to percisoin aim since ryu auto aims when you fire the arrows.
Same for the viggor emperor, move around to dodge the beams and use inferno on him about six times then on his next form just use your flail to destroy the skulls dodge his head and fire arrows at his head until the skulls come at you, the whole fight shouldnt take more than 3 minutes.