As much as I hate how the airline has gone down the pan during the last 4 years, I still think you should come for your interview.
Its all about perspective, we all have our reasons for applying, coming, staying or leaving. If you have a good job on nice equipment, with a fairly decent future, stay where you are. If you don't, then you have nothing to loose really.
Just remember, they will be trying to sell you the nice shiny pretty, well funded company. You will only really be able to assess just how much they manipulated the truth, after you have been here about 2 years.
Good luck!