i have a andorian and a saurian on fed , though with the alien gen with the flexablity with being able to change appearance at will . makes it really easy not to pick the other races to make your own .
For the Pakled I imagine it's because they're an 'ugly' race, and their only defining characteristic from the one episode they were central to is , "Dumb as bricks.", so I can see why they aren't a huge draw for players.
For Saurians I guess it's because we don't really know a whole lot about them, and their appearance customization options are rather limited.
Tellarites I dunno, I think they're awesome and I play one myself. I guess it's a combination of appearance and people wanting to maximize their trait value.
Though really, there are several Federation races that could be considred 'redundant'. Humans, Vulcans and Aliens vastly outnumber every other race from what I've seen.
Then you're in the minority, because most players view Saurians as hideous.
And I was speaking purely from a humanoid point of view, Saurians aren't what we're used to, so they're not as appealing as Liberated Borg, who can appear to be fully humanoid.
As from an aesthetic point of view, the Saurians are just a joke.
Turian, Krogan, Gorn, these are good examples of reptilian species.
Just by looking at them you know they are reptiles.
The Saurians are just a pink bag stuck on a mammal's body.
And think about that for a moment, if they are a pure reptilian species, their females wouldn't have something that mammals do.
Turian and Krogan females certainly do not have that particular feature!
They resemble the males quite closely.
And for a mammallian species, telling the genders apart is quite difficult (unless the female is talking, because her voice makes it obvious).
Although for a Turian female, it's quite easy, they don't have the cranial spines that mark a male Turian.