Shallow gameplay, features that aren't implemented or badly and a general low quality feel to the game makes this no replacement for Freelancer or X. I don't know where to begin, so I'll just ejaculate my thoughts as they surface:
Ships, which range from sub-capitals (Gunships) to dreadnaughts, all feel like fighters. They've got turrets, but there's no feeling of "weight" behind it all. No tracking needed, stuff turns on a dime. Shield and armor feel useless. Fighters and bombers just "blip" into existence when you launch them. Worst of all is that you're made to believe this is a space game, yet there's no trace of inertia - shut off the engine and you come to a perfect stop. I'll admit that this is hardly the only game that's guilty of this faux pas, but it's extremely noticable in SG2. The main mode of travel, "power to engines", is slow and takes any feeling of fluidity out of playing.
Too many factions. All of them without any personality or motivations. Building up a reputation doesn't seem to do anything, and the game randomly turns them hostile or friendly towards the player during the storyline without any lasting damage or benefits. Devs, instead of having 36 factions (I'm not making this up), just have a couple of main players on the political stage and a few overt bad guys (Pirates + the Big Bad).
Quality of the game is lacking. Voice-acting is terrible, accompanied by large amounts of text between main missions. Do not play this game for the main campaign, for its storyline is the most blaise of generic sci-fi crap and daddy-issues (Which also assumes you have played the previous SG's campaign).
German and eastern European developers - stop using local "talent" as actors and writers. The accents are horrible ("Ze Germans are comingk!") and the amount of spelling errors and horrible construction of sentences in the written text makes me just wanna skip all the nonsense.
All of that, and it's not feature complete. There's this whole section of skills, perks and abilities (even a class) dedicated to fleet combat, but you're only ever in control of your own ship. You can hire mercenaries, but they require regular payment, you don't get a group of ships to command and control. Docking (or "anchoring" as its called in SG2) is non-existent, you just float up to a station and press a button. Not that stations are that necessary - they only feature to have a place to save the game, repair and rearm and buy crap.
tl;dr - vapid game devoid of any passion. Galaxy looks nice though!