Music: Fantastic. Extremely good tribute. Official soundtrack to be available?
Cinematography: Looked excellent. That's what really sold this. It looked wonderfully cinematic.
Acting: Hit-and-miss. Good in some parts, but not in others (mainly in line delivery). This, unfortunately, made it feel more like a direct-to-DVD thing, rather than completely professional.
Predator: Great costume, but suffered from the period of time! Surely, it should have been a less advanced, primal-looking Predator? I was expecting to see homeages to the elder from the second movie: Alien-looking sword instead of wrist-blades (which would have suited taking on its historical opponents) and laser on the gun, itself. Instead, it was modern. The actual workmanship which went into creating the suit was great. Didn't quite buy the sword fight at the end, mind you... Felt too human. Should have had a noticeably different combat technique - more brutal. Also thought that it was revealed too early.
Continuity: A few strange moments. The above weirdness of a modern Predator in ancient times, for instance and the Middle Eastern character saying they had noticed it bleed, even though we saw no neon green (including after arrow penetration).
Writing: Relatively well done. Could have done with some improvements and more historical research, but it did the job. Would have benefitted from things like extra dialogue for the small group of heroes to show what kind of adventures/experiences they've had, because there wasn't much characterisation for them and they came off feeling a bit too 'red shirt'-like. They were like Dutch's team, but without any of the stuff which made you feel much for them.
So, definitely one of the better efforts out there, but could have benefitted from some extra scripting and better directing. Not sure if that was because of the shooting schedule, of course.