I don't particularly like ninjas or even pirates for that matter. I think space marines (the ones who descended from The Emperor, thank you) and robots are way cooler anyway. also dwarves I think dwarves are pretty badass, even before i read lord of the rings i thought dwarves were cool. Little guys with axes who dig for treasure? Awesome. but i digress.
As i said i have no great love for ninjas, they're cool sure but i can think of cooler things. I will still go to see this movie because even if it isn't great for production values i want to see more stuff like it. in essence i will see this movie becasue i like what it represents. the idea of spagetti action movies. Spagetti action, like westerns, are set in presenmt day or something, not a whole lotta depth but some cool fight scenes and adding some badass points to an actor i may or may not already like. Like Shoot'em Up, ninja assassin is one of those movies where i can spend seven bucks at my local theatre, sit down get two hours of entertainment and walk out.
it doesn't require a big commitment, i don't have to worry if it's going to be sold out or not, it's not like some deep plotted movie where i have to think about the meaning (SCREW YOU MEN WHO STARE AT GOATS!), it's just mindless fun for a little while then i go back to the grind of real life. sure i'll forget about it five minutes later but sometimes all you want from a movie is a couple of hours of entertainment. and frankly if we can get some good action movies that are slightly original thats good too.
I mean think about this. Sure this is a bunch of ninja cliches all lined up, but it isn't a remake that has been done before, it isn't a sequel, it isn't a book adapted to movie it's just a film written to be a film that is in a sense original.
but yeah that 30 second reveiw at the beginning is pretty much all you need.