Those who go back a generation or 2 of FS might be able to comment on how good FSX is, compared to older leaps between generations.
I go all the way back to FS5 which I played to death, lost interest until FS2002 and ATC, with good-looking aircraft thrown in.
I know many hate the ATC yada yada especially RL pilots but that's what brought me back, I reckon FS2000 - FS2002 was a huge step.