I was a massive X series fan right up until Terran Conflict and Albion Prelude and was looking forward to Rebirth more than any other game I've ever played.
Unfortunately the game was a huge disappointment. Not just in terms of the bugs and lack of stability but what I saw as the extreme dilution of the mechanics and gameplay elements that had become staples of the series.
It felt very much like a console game that had been ported to PC and was incredibly limited in scope compared to its predecessors.
Egosoft are good with patches and free updates though so I was hoping over time it would approach something like what I envisioned from an entry into the X series.
I haven't touched the game since a week or so after release.