My feelings on this game are well documented on this site, and just like The Bureau, this is a game effectively throttled by the original game's fanbase.
It didn't matter that Syndicate basically did Watch_Dogs before Watch_Dogs was a twinkle in Ubisoft's eye. It didn't matter that it was by Starbreeze, who had shown with Chronicles of Riddick: Escape from Butcher Bay and The Darkness that they were (and still very much are) a competent developer.
It was Syndicate, as a shooter -- and those five words doomed the game to being shunned.
The particular irony to this one is, it did not review badly. Most places had to admit that it was a genuinely good game, even if a few reviewers, like Jim Sterling, found it forgettable. Most scores were around 7 to 8, which is pretty good for a complete series reboot.
Still, the fanbase insisted it was bad by default, so the game sold terribly. It struggled to break 500,000 units on launch day, and while it still has a trickle of sales now, the damage was done. EA put enough faith in the game's co-op to even remove its Project Ten Dollar from the game, but even that couldn't sway interest. Now it remains one of the highest-polish bargain bin games available.
The lesson here being, sometimes keeping a closed mind benefits no one.
If you'd like to give it a try, it's running an average of $9.99 to $19.99 for PS3, Xbox 360, and PC.