well hello =)
i'm not against pvp.
nor i am against asymetrical pvp.
nor i am in this game.
it's fun.
and i think if players are organised, stays grouped and focused on the mission (even better if one of them can take the antag down) most of antag will be no match for a team
(well, ok, it will depend the lvl of the mobs of course, since they can be far stronger than any antag...)
moreover, there is very good counter antag characters.
so yes, some missions are really antag friendly (exactly like some are not), and the good counter antag characters are not always usefull for missions objectives, and as you don't know if you'll have to face an antag or not, sometimes choosing them can be a flaw for the rest of the mission if antag don't shows up...
but i'm pretty sure a good team of players can bash the face out of most antags...
in fact, i think that right now, the real power of antag is, in the great majority of their fights, they can smash down new players because they are no match in their knwoledge of the game, in their equipment, BUT in addition of all that in their inner lvl bonus... (really stupid idea, that one, only here to praise ego of old players in order they can make puke blood to new be...)
or retarded rank *1 player who absolutly don't know what they are doing in this game whereas they must play it for months...
but all this being said, facts are almost all games, even pure pvp ones like mobas, propose non pvp mode...
specially to new players, the time they get used to the game mechanics and become more confident.
so why not do this in this game too ?
for example, make the same as for solo mode.
when a player does not have made a mission 5times, he can't encounter antag on this missions.
(in fact, no, give the solo mode from the start, so people can train AND keep this restriction for pvp)
add this with a short and drama scene/message when each mission become available to pvp in order to warn the player so he can get used to the idea and you'll have a more smooth pvp immersion.
maybe add an "AI antag" in solo mode too, always to make things easier to accomodate with for new players.
you should compare this to sodomy you see, when you're new at it you can like it, but you're partner will have to make it gently first, otherwise most won't like that.
same in games friends.
we can take pleasure being sodomised by old veterans, but first times have not to be too rough and unprepared, or it will just disgust the majority. ^^
and that's what you are doing right now, with antag and absurd cheating AI.
add this with all that random flaws in fight, and most people don't even want to try and get used to it. they just think, "no thank you, sodomy is not for me", and leave.