Guilin Peaks is infantry heavy and wouldn't be out of place in the Close Quarters map pack from Battlefield 3, but the layout is open and topography varied enough to prevent bad bottlenecks. Bikes and aircraft make getting around and putting pressure on big packs of infantry interesting.
Silk Road works pretty well. It's a big hotbox of chaos but the layered terrain and multitude of vehicles seem to balance everything out. I don't feel I'm under too much pressure from any one particular type of player, yet also feel I can roll as them if I want to. You do need to exploit bikes and such to get from A-to-B, but infantry combat is plentiful.
Haven't played enough of Guilin Peaks to really appreciate what it does right and wrong.
Dragon Pass is too fucking open, large, and flat. Simple as that. The topography has little variety with the exception of the rivers, which don't really contribute much since there's always ways around. This gives all heavy vehicles like anti-infantry and tanks a huge firing range against general infantry. Choppers also get a good bit of wiggle room. The only viable infantry option is to go sniper and exploit the openness just as much, which in most Conquest matches simply regresses the formula to deathmatch. The river should be interesting but nobody seems to give a shit about boats/jetskis when anti-infantry and tanks are all over the shoreline and choppers are in the sky, and the way it breaks up the terrain into bridge bottlenecks again favours vehicles over infantry.
I can see why someone who likes that kind of map style would love it, but I think it's awful and easily the worst map of the four in terms of encouraging a good diversity of encounters and play styles.