How bad is it? It's okay, if predictable.
Should you see it? It's watchable. If you've seen Turbulence 2, you've seen most of it, though.
This was the last film released by Trimark Pictures. A rock concert on a plane is being streamed on the internet when it gets hijacked. Rutger Hauer and Gabrielle Anwar are in this, so the budget couldn't have been zero, but there's a lot of plane footage that looks like it came from earlier films in the series. The actors supposed to be heavy metal musicians aren't believable (well, no more than the hacker or FBI agent), the plot is completely predictable - a non-pilot has to land the plane as guided by ground control, there's a substituted "double," and one of the helpful passengers turns out to be a bad guy. The film is so full of cliches and low-budget gaffes that it can make for a passable viewing experience.