I actually don't like the metagame changes they've made. At first I thought "cool, that will create more teamplay" but in the end the lattice system and the alerts just force the entire population of one server into 4 or 5 battles, while all the stations that are not on the path of an objective (or worse, where there's nobody to start a fight with) are virtually deserted. Considering small squad action is by far more enjoyable, that's a net loss. Also vehicules except galaxies and AMS sunderers have no tactical relevance whatsoever, due to the fact that an inf zerg can vaporize anything in seconds, and unless very lucky you either meet nobody or an inf zerg.
I also think they went overboard with the base redesigns. Especially in biolabs which were already quite closed, they made chokepoints even more chokepointy, combined with overpopulation you get 64p metro levels of retardness.
PU1 and PU2 have improved performance a lot. MAX units are still too strong partly due to the aformentioned overpop battle focus IMO, but they got nerfed. Small arms are more balanced than before. There's a lot of new content compared to early 2013. The game is definitely not P2W or at least has not been until now, as they have been buffing starter weapons / nerfing the others quite a lot, mostly for vehicules.