First off, no. Its nowhere near as good as 2 - or even 3 (not counting the plot twist and on of course). This was maybe the 3rd best RPG to come out recently (#FE shyts on it and God Eater Resurrection is simply better even as an upscaled PSP/Vita game).
This game.... Like, you can just tell that it was pushed out because the fanbase still existed. The devs just didn't have the power to push anything solid top to bottom out and it showed. But because it actually did come to be after the horror story that was SO4, its probably likely that a re-release or remaster of SO2 will come out in some form in the next 2-3 years.
But in all honesty I think the franchise is dead as fukk. It sucks because Scifi RPGs are so damned hard to come by.