I disagree. Wolverine deserved that rating for sure. And if the movie had been any good to begin with then the leak simply would have shown that, story-wise. The only things not in the leak were the finished SFX. And bad SFX(which the final movie did have) were really the least of the film's problems.
Let's take a closer look at the movie, compared to other X-men movies & other superhero movies. First, the movie wasn't that great, I'd put it around 50% rotten, which isn't a great rating, but I do think it got the bad end of the stick.
1. Credits were AWESOME, showing Logan and Creed going through war, and Creed becoming more and more blood thirsty. Liev as Creed is MUCH better then Creed in X-men (thug!). Best Credits in any Marvel Movie? I think so.
2. Set Up was fine, nothing special. Wolverine leaves the crazy group under Stryker and Gets a Girl, then believes Girl is killed. I liked the crazy group, however corny and cliche they were, it was fun, and funny together. Wolverine is a walking cliche, so don't expect Batman or Iron Man here.
3. Adamantium scene, I thought was pretty well done. Did it's own thing, and still kept to Continuity. It was the most intense part of the movie.
4. Animal Side - It wasn't very violent, like Wolverine could have been, and he didn't run with wolves, which could have been cool. But for PG-13, it's about as Badass as you are going to get it. Hugh Jackman was more Badass in this movie, then any other X-men movie, overall. He was bigger, he was less conflicted to do the right thing. I wouldn't go so far to say that he was better then X2, Mansion, but X1 and X3, much better.
5. Gambit - I liked Gambit in this movie. Could he have been better? absolutely.
6. Ending - My favorite part of the movie, is when Wolverine goes nuts when Creed is about to kill shadowfox for real at the end. The entire movie Creed has torn Wolverine new underwear, but that scene he just kicked Creed half way across the hall. If you are a Deadpool fan, then I can understand why you don't like it. Deadpool was sacrificed as a character for the movie, and Marvel and Fox did not realize how popular the character was until they threw him into the mega mutant experiment. However, I liked the X-kids and Professor X, I like how Wolverine was left with no memory and shadowfox was killed, and he didn't know what happened.
Visually Effects - Bad at times, but Good at times. Much better then X-men. But Visual Effects, like you said, don't show how great a movie is.
Story - Alright, much better then the X-men story where Magneto has a mutant changing machine to turn people into mutants? this story was much better then that crappy plot point, which was the whole scheme. I like X-men for the tone, action, acting, directing, ext, but the story falls flat. Fantastic Four, which is also on your top 10 list, was also not as good as story as Wolverine had.
Unfinished Movie on Web & Expectation killed this movie. I don't care what you say, an unfinished movie (visual effects and music) effect how you watch a movie. And seeing it unfinished can give you an unfair view of what the movie was trying to present. Expectations, it's unfair to think that Wolverine (walking cliche) would be better then The Dark Knight or Iron Man, which people expected, because they were released the year before. The movie fits fine into the X-trilogy. Not only that, but I think overall, it's a better movie then X-men, and maybe X-men 3, maybe. Wolverine better then the plot mess of Spider-man 3? Maybe. It's obviously mostly my opinion, but I think Wolverine was a better movie then most fans give it credit for. It never tried to be anything but a fun summer pop corn flick.