Obviously made by fans of the original (a good thing). In fact it's almost a remake, ticks all the boxes - it's just that the plot is hugely confused though.
My favourite quote from one of the reviews is, "There’s so much wrong with Terminator Genisys it’s hard to know where to start, but the script is the obvious place..."
The characters just say some stupid things so its fun watching the other actors hod and try and look interested. "Reverse the neutron flow of the flux capacitor, you say?" etc. And don't get me started on the number of random time machines that pop up conveniently.
Worth seeing but just don't expect too much.