I thoroughly enjoyed this film. The graphics weren't up to say Episode1 standards, but were convincing enough (and I loved the raspy engine noise for the Rapiers). The acting was what I've come to expect from these younger American actors (as in good).
I'd say from an objective view point it's a good film. A bit lacking in certain areas, but certainly enjoyable.
I say "objective" simply because I have never been exposed to the hugely popular game series, so I was seeing this as a film, not as a spin off (in which case I'm sure it would come across worse, simply because when you're used to one set of actors portraying your favourite characters a new team will never fit the bill).
Overall not a bad way to spend my Wednesday evening.