Thing is, that's just the Federation. Who are pretty retarded when it comes to sensible ship designs. Once the Khitomer Accords got signed Starfleet literally had no reasons left at all to make ships dedicated to anything other than science and exploration. So that was pretty much every ship they designed for the next 100 years.
I mean, look at what we get when the Feds actually apply themselves: The Defiant.
Hell even some of the other later Dominion War / Borg Incursion era ships weren't too bad (The Saber class for instance, Intrepid isn't too bad either.)
Now, let's compare to the other races.
Klinks: The Battlecruiser from TOS, sure that neck looks spindly, but that's intentional, the bridge section is put there because a) It's keeps the command crew furthest from the hidiously radioactive warp cores. b) In the case of a crew mutiny, they can remotely trigger a warp overload, detonate the charges in the neck boom and use the impulse engines in the head area to escape.
The Bird of Prey is a cloaking ambush attacker, and their later stuff is just heavy and chunky looking.
Romulans: The D'Deridex is literally made to look larger and more dangerous than it actually is. It is still pretty fucking dangerous though. Pretty much everything else they do is a flying wing design of some kind or another.