Bulletproof Fighters - Love the bulletproofs, but think there are generally other, better choices than having another cap of fighters.
Tachyon MicroFighters - Don't know, but after 3.0 I won't touch them until they're rebalanced.
Raiders - Don't know.
Parasites - Currently being discussed.
Vampire Claws - I've always felt these are underpowered, I might just be using them wrong but they always die REALLY fast. They have nowhere near the staying power of Viral Shredders.
Raptors - Underpowered
Snipers - Underpowered
Space Tanks - Don't know
Electric Shuttles - Don't know
Vorticular Cutlasses - Underpowered. See this link
http://www.arcengames.com/forums/index.php/topic,7647.msg65737.html#msg65737 for my suggestion on rebalancing cutlasses by removing self-damage from them, and other changes.
Infiltrators - Less useful now that AI defenses are mobile and not the turret blobs. Used to flatten fortresses in no time flat, and now don't do that anymore. Suggest making infiltrators good against fortresses again.
Eye Bots - Freaking LOVE these things. I hate forcefields with a passion and am way too lazy to wait for bombers to deal with it, and I hate hybrids with a passion, and these things flatten hybrids like there's no tomorrow. In fact, if I'm playing against hybrids, these are pretty much guaranteed to be my bonus choice unless I'm trying something new.
Spiders - I like them, but probably a little underpowered.
Laser Gatlings - Bonuses and attack rate look like they're good, but armor ratings make them not so good.
Autocannon Minipods - lol. bro tried to scratch the paint on a mk1 fortress with 3 full marks of these things. The things were so useless I think they actually healed the fortress.
Deflector Drones - Don't know. Intriguing, and I liked them in 3.0 just as long-range, high damage suppression fire (they were kind of hard to kill because it's really difficult for the AI to close with a giant blob of them, but with the general range increases for everything recently, likely to no longer be the case)
Space Planes - Mediocre now. They used to be off the hook with their ridiculous damage potential (when shields were still being used), but now I don't find them very useful for anything.
EtherJet Tractors - These have always been amazing, just for grabbing an enemy fleet and running. Their damage is secondary to their usefulness for dragging things around.
Force Field Bearers - Don't know
Armor Ships - Don't know
Anti-Armor Ships - Useful, but die too fast. I use them to squish Hybrids, and I prefer Eyebots for that job, actually.
MLRS - I like these things. Solid ships.
Munitions Boosters - Don't know.
Teleport Raiders - Don't know.
Teleport Battle Stations - Don't know. (I've had problems with AI teleporting units teleporting through wormholes that are guarded by forcefields on the end they're teleporting through. That might need to be looked at, but I haven't bothered to post it on Mantis yet. Whoops.)
Zenith Remnant Unlocks
Zenith Bombardment Ships - Not very useful for humans, if you're in a situation in which their range can actually be used, the situation is probably under control without them, and the resources could've been spent better other places.
Zenith AutoBombs - Freaking LOVE these things. I don't care what other people say, these things are amazing enough without armor piercing. Build 3 factories, stick two engineers on each, and have them FRD to some random AI planet for great justice.
Grenade Launchers - Don't know.
Zenith Electric Bombers - Really hard to kill, but not enough damage against specific targets to make them worthwhile.
Sentinel Frigates - Redundant with snipers. See this post
http://www.arcengames.com/forums/index.php/topic,7789.msg65742.html#msg65742 for a suggestion to make them into more of a mobile defensive (similar to a player version of a guardian?) unit to hold off small incursions by themselves, or maybe larger incursions in groups.
Zenith Mirrors - Don't know
Zenith Paralyzers - Underpowered. There's not a lot of point in paralyzing fleet ships in most case, unless you're just trying to stall, in which case these things are going to get wiped anyway.
Shield Boosters - Don't know, but most of the stuff I use regularly has low armor anyway, so they probably wouldn't have much of an effect for me.
Zenith Beam Frigates - Don't know (probably less useful for players now that they don't fire through shields)
Zenith Chameleons - Don't know
Zenith Polarizers - Don't know
Zenith Viral Shredders - Hilarious. I approve.
Impulse Reaction Emitters - Don't know
Acid Sprayers - Worthless. Even with the insane multipliers, they still have lower DPS than most other units even against their special targets (consider fighter vs. bomber and acid sprayer vs. bomber, for example)
Children of Neinzul Unlocks
Neinzul Youngling Commando - Don't know
Neinzul Youngling Tiger - Don't know (terrifying when a hostile roaming enclave shows up on your home planet and drops 150 of the things)
Neinzul Youngling Vulture - Don't know
Neinzul Youngling Weasel - Don't know
Neinzul Youngling Nanoswarm - Highly amusing! Weaker autobombs that reclaim. I approve.