So I guess the questions then become:
1) What would you change in the current game to make the game "completely successful" in your mind to satisfy your view?
This is where it gets tough. Given that the main arena is a "sandbox" type play area you MUST have all types of play available, even manning the guns. However, HTC could tweak things to make combat a better way to go.
Example: Bish seem to get on a roll sometimes and they grab base after base using 20-30 guys. So being a "sandbox" this option must be available, but if HTC made it so the field and town hardness increased with the number of attacking players in the dar circle, this would make the "horde" version of an attack harder to get everything down. On the other hand, a smaller group would have a lighter hardness (due to smaller numbers of attacking players in the dar circle) and still be able to accomplish the base grab.
So while the option for the "horde" mission is still there, would the players actively break up in to smaller groups to hit 3 bases at once and so create more fights?
See what I mean? I dont know if something like this can be done, but things like this are the things HTC could put into the game to guide players into more "combat" type play with out really forcing them into it.
2) How many players do you consider this to be "a success" in your mind?
To me personally we have an award winning community here, a decent number of players to give me more than enough of a challenge within the game, and a variety of gameplay to suit my needs. While I do have frustrations with the game in terms of why certain things happen (1 ping kill shots in GV's, or laser guided ack, 110 Rocket dweebs that destroy my bombers after flying for 1.5 hours...etc) these are things I have come to accept in the game for now which still make it worth my $15 a month to play and why I continue to do so. I suspect you are the same in that aspect with your own personal gripes. Not to say that we can't comment to make things better... 
Cheers,
Elec1
Numbers is a map specific thing. You put 200 players on ndisles and you have some kind of action going on all over the place. Put the same 200 on craterma and you are lucky if you have 1 fight on each front and NOTHING in tank town.
Im glad they seem to have only smaller maps in the rotation at this time. Whether that is on purpose, or only because they havn't updated the other maps yet I think it helps. Any time you get one of the bigger maps it take more and more players to generate any kind of action. Instead you get a lot of "sneaks" and wack a mole type base grabs. Player avoiding combat just trying to grab a base real quick with out anyone noticing.