Hoo, boy! You asked for it, Mikhael, so here comes the constructive criticisim!
ECW Anthill - Uhm... ok, the propellors make me think "Terran" and "nebula", since there ain't anything to blow around in open space. But there doesn't seem to be anything to blow nebular gases towards - no collector or anything, so.... what's it for?
ECW Diamonback - Hmmm, can you say, Z-95 Headhunter? Anyway, somehow I don't thinnk that one fits in FS as a regular fighter - perhaps a custom, hot-rod-type pirate thing?
ECW Dragonfly - Nice Orca.

Those tail fins really give it an atmospheric-craft feel. Dunno if that's good or bad, though...
ECW FireAnt - Uhmm... okay.... what is it? Another atmospheric helicopter thingy, yeah, but....

Zeronet will like it, though - micro-hangars!
ECW Journeyman - Simple, yet effective. The long, protruding guns aren't all that Freespacey, but who's counting? Would be cool if it had Myrmidon-like bomb capacity - rush in at high speed, drop the bomb, and then engage the fighters.
ECW Mandrake -

I love this ship!! Asymetrical rules - especially asymetrical Terran, which this looks to be. I love what looks like vectored engine outlets, makes it look like a perfectly designed dive-bomber, with the emphasis on the "dive".
ECW Mystic - Hmm, now that I've talked with you, Mikhael, I know what this fixation with propellors is about. Still...

Anyways, this one kinda reminds me of Luke's landspeeder in a way. It does the job.
TG Truck - Other than the nice chamfered edges, I have no comment.
GTB Rhino - A bomber, definitely. Has a nice unrefined look to it - very utilitarian, very it-does-the-job-and-that's-it feel. Cockpit may be a bit large, comared to the size of other FS ships - unless it's a 2-seater.
GTC Eris - well, texturing makes a world of difference, but this doesn't look like a cruiser to me - more like some sort of Vasudan prototype strike bomber. I like it in general, though.
GTC Gar - Very Aeolus-like - I assume it's a Mk II - type thing? Only thing I dislike is the engine block - looks like cargo containers. See about building a hull around those exposed engines.
SB Yali - Very Cool. Only nitpick is the 2 long struts on each side look too much alike - deform one of 'em at an endg or something, bend it back, forwards, inside-out...
SF Naga - Screamin' Space Superiority there!
SF Recluse - Sorry, but this one I just don't like. IMHO it looks way too much like an insect - even down to abdomen and mandibles! I don't think Shivan ships should actually be recognizable as anything specific - they can remind us of the look of something, but not be "exact" copies.
SF Wasp - Hmmm... I have basically the same complaint here as I did for the Recluse - it looks like a genetic cross between a butterfly and a wasp. However, I do think that this one is salvageable - maybe bend the wings in half drastically, add a bomb bay between them, and remove that abdomen... something like that. Just get rid of that exact butterfly-wing configuration.
SF Vampire - Again, same nitpick. I specifically don't think Shivans would employ something with wing braces or whatever - the "arms" of the bat, with the wing stretched out between them. They just don't fit.
SI Nest - Ahh, now these we don't see enough of - Shivan "bases". Kinda hard to get a mental picture of the geometry on top there, but that's a good thing with Shivans, methinks.

I like the vertical, non-symmetric orientation, although those leaves are, uhm... well, they'd better rotate!

EDIT:
TVF Panzer - Coolest untextured color scheme, bar none! Oh yeah, the model is sweet, too. I'm not sure about the 2 Big Bertha cannons on the wings, though.