I've got a feeling Villareal will get to the Final. Arsenal were shite against Roma and Hull, and are dodgy to say the least.
The 2nd leg for the Mancs is away to Porto. I can see an upset here. They don't have the same air of dominance in Europe, pressure is always turned up a notch or two, due to their relative failings in the CL.
Even if they do get past Porto, I see Villareal giving them enough problems to beat them.
Defo not a forgone conclusion that the Mancs are in the final.