Yeah, it's pretty bad. I think seeing it again now knowing that they do get better afterwards made me less harsh on it, but it is by far the worst of the series up to this point. I will say that it is actually so dated that it's kind of entertaining in a "yup, this is definitely a bad movie from 2009" way. Hard to believe a film can become such a relic in just twelve years but they managed it.
It's really just a baffling movie on a conceptual level, because it teases us with some scenes about Logan's life before agreeing to be part of the Weapon X program, which would have made for a far more interesting story. But no, we have to bring Stryker into it again for whatever reason and it has to be all about him getting the adamantium because we haven't seen enough of that yet
and the less said about the movie's treatment of Deadpool the better.