Oh, dear - how best to describe `A Haunted House'... it's the sort of unofficial sequel to the first couple of `Scary Movie' films, only the people who made the first two didn't return for the next ten (or however many sequels they've made by the time you read this). So, instead of having anything to do with the parody of `Paranormal Activity' which is basically what `Scary Movie 5' is based on, Marlon Wayans, is doing his own spoof.
If you've actually seen Scary Movie 5 before you've watched this... then I wouldn't bother. Both parody Paranormal Activity and use the same `slapstick formula' jokes. A Haunted House uses a little more `risky' humour, but it's primarily people tripping over or getting up to sexual shenanigans.
But is it funny? Well, it's about as funny as any fifth movie in a comedy franchise (even though it's technically not part of the Scary Movie franchise, you could be mistaken for thinking it is). Was Police Academy 5 as funny as the first? If you're thinking of watching this, you'll get a couple of laughs and smirks here and there, but it's not great.
If you like horror parodies, stick with the first Scary Movie. Since then it's been pretty hit and miss from there on. It might keep you amused if you found it on TV late at night and were slightly tipsy.