Personally find track useful combined with a flame commando or other damage card to remove a big buffed bastard.
Also Immolation drone sucks, but it can be hillarious with brimstone artifact if your opponent have a lot of non-fliers in defense. They'll all burn. (works better with Champion of Ruin and brimstone, that's just sick).
As for FD Vanguard he has some justification in his morale cost of 0.
My top ten cards I'd never include
Scramble (way too random and unreliable, besides the effect is minimal)
Ancient egg (Takes too long and the offcast is too random)
Masked initiate (useless character, can't come up with a single reason to use this card)
Nys the hungry (not good enough for his upkeep and too easy to kill)
Kinetically overloaded drone (takes too long to get to some nice stats, and GI have plenty 1 cost options)
Vandalize (I realise factionless are worse than the faction cards that do the same, but this is just too expensive and with no other effect)
Breeding grounds (tempo killer)
Unfazed (I can see specifik situations where this card can be relevant, but generally it's a dead card)
Irial (too expensive for a ramp/rush faction)
Honor Hill (way too expensive)