As a DA player I can say they are not at all weak even with the so called bug. I don't even consider it a bug, IMO the Believers immunity to mind control is a fanatic, not a hacker thing
. Thats from an ideological rather than "game rules" perspective. Strictly IMO.
The DA's primary strength is starting with Planetary Networks which is one of the best techs in the game, bringing the best early game SE, the probe team, the VW and the Network Node.
Finally it is a pre-req to Ind.Auto which is possibly the most powerfull builder tech in the game and bringing the other best early game SE (for builders).
The planned effect gives DA an effective +2 Growth +1 Industry for the early game period, great for churning out pods.
A DA player can research Ind.Base, Ind.Econ and Ind.Auto just like that, giving them the 2 SE's they want (Free Market and Wealth) and lots of buildable infrastructure in just 3 techs.
This benefit is obviously stronger in slow tech games, if the University immediately researches Plan.Nets and shares it with everyone then there isn't much benefit. But that's not likey to happen considering that Plan.Net has a SP.
The other DA bonus, the Probe Team gives a scouting benefit and it can be used to pop-pods. Sure you'll lose the probe team to worms (or a probe action) sooner or later but it's still a nice early boost on par with the spartan starting rover.
And then there is the 25% lower probe action costs and the tech steal, neither of which I find particullary significant because the DA's are such a strong builder they wont really be relying on tech stealing, altough the better probes and cheaper actions is a nice extra boost.
The final bonus is the lack of any significant penalty, this gives the player full flexibility in choice of SE. It also means any strategy is valid, builder, hybrid, momentum - the one time I played DA momentum I was pleasently suprised, they start 1 tech closer to impact and already have probes, what more could a momentum player want... (if you reverse engineer the probeteam you don't even need mobility for rovers - not that I would advocate doing a thing like that
)
So overall on a large map I would put DA firmly in the top of the pack, 4th equal after Univ, Caretaker, Ursuper. On a small map I would still rank them pretty high, in with the "Good" factions, probably still 4th equal - especially considering the potential playing momentum, they could prolly go toe-to-toe with any of the traditional momentum factions and come out on top.