(Hi, new here.)
Well, first thing about it is continuity: The Marvel movies -- all of them -- exist in their own continuity. For the non-X titles, that's somewhere between Earth 616 (normal Marvel Universe) and the Ultimate Marvel continuity. The writers have drawn from both continuities. Even some of the details that seem wrong are usually somewhere in a comic, even if it's a passing mention or allusion. (The movie continuity has established a relationship between Wolverine and Sabertooth, for example, that was alluded to but dropped from the main comic continuity. But it was mentioned.)
So, was the movie consistent with the movie universe continuity? I suppose. I really don't remember enough about the prior movies to say for certain.
The pacing was SLOW in parts. Well, a lot of parts. For example, too many shots of vehicles traveling through the Canadian (or wherever they shot) wilderness. A couple times I was gritting my teeth wishing they'd just get to the next plot point.
The plot was straightforward. The biggest problem was that the movie plot only served to put Wolverine into the circumstances he was in at the beginning of the X-movies. It's not a plot that allows for the hero to have a real victory since it ends with him losing his memories. Most American, and certainly all Super Hero, movies end with a more clear victory for the hero. That didn't help.
The visual effects and stunts were very mediocre for the budget this thing should have had. The close up of the claws in one scene was particularly badly lit. They could have done better. Fight choreography was ok, but nothing spectacular.
Acting was good from Jackman and whoever played Sabertooth (forget the name). Deadpool was portrayed pretty well at the beginning of the film. Most of the other characters were kind of bland. Not really bad acting for some, so much as they didn't have a lot to work with. Still, there were some laugh out loud moments during the film.
Overall, I'd give it a C. It was very average. They could have done better with the budget they had, especially in editing (for pacing) and special effects. You won't miss much if you wait for DVD.