Player pool tendencies depend more on, which games you play, than specific sites. If a lot of your activity on GG Poker consist of using the free $0.25 tickets, you get for Spins and Battle Royal, or playing freerolls, then you will see a lot of people going all-in preflop with bad hands and resulting "crazy" runouts. But that will also be the case, you you play similar games at other sites.
But if you play even just 10NL cash games, the play is no looser than on other sites, except for the fact, the full ring games play with an ante, which makes it correct to loosen up a bit. But apart from that its the same mix of regulars and fish as 10NL on any other site, I have played on. Its pretty rare, someone are all-in preflop for 100-200BB, and when it happen, its usually some kind of standard set-up like KK vs. AA.