I never gave it a 1 or a 10. But it did entertain me and the visuals were stunning. Shots like the valley full of mist near the beginning, the mammoths, the sailing ships going down the Nile, the shots of the pyramids - all were stunning. The effects were excellent.
By the way, they weren't 'cracked out ostriches', they were giant predatory birds called Titanis which, at one point, were believed to exist around 10000BC, though it's now believed they died out before that. Not that dates matter, this was a prehistoric fable.
I wanted more creatures, to energise the pacing later in the film.
I'm totally aware of accurate prehistory yet I was able to enjoy this movie. The mammoths looked totally real, as though right there on screen. The sabretooth slightly less convincing, but excellent nonetheless. Everyone flinched when it leapt forward in the pit, as though going to attack D'Leh, and that signifies that the FX worked or it wouldn't have had that reaction.
People have to enter into the spirit of the movie. Maybe I'm more skilled and experienced at this, having been introduced to prehistoric/mythical creatures through the stop-motion animation of Harryhausen in films from long ago. I suspect it's the younger generation who lack the means to suspend disbelief - if they aren't whacked out on E or God-knows-what to find pleasure, then they're cynical of everything.