I mean...it's not awful...
First things first, this novel is written in first-person perspective, which is a personal pet peeve of mine...but it also seems antithetical to Star Trek. Star Trek is about ensembles, casts of characters, diversity in perspectives, and here, we are limited to a singular point of view from a stranger.
Second, there is a huge tonal shift in this character in the last 20 pages or so. She goes from a bumbling, stumbling, no confidence, non-entity, to a tactical genius with all the answers who resolves the problem by just sitting in the captain's chair...all those previous issues with the super ship - dissolved - all her previous inability to do anything - vanished. I was doubting the "Mary Sue" descriptor other reviewers pegged her with, but those last 20 pages illustrate the severe fanfic-ness of this work.
The protagonist is Human - a colonist with no last name on a planet on the edges of Federation space named Proxima. According to her, their colony is so small that they haven't developed the need for last names yet...um...um...but, you're Human...um...would not the original colonists have already had their last names? And...if the colony were that small...would it not have made MORE sense to keep those last name to avoid the chance of inbreeding? Also...Proxima. Proxima Centauri is named as such because it's the closest star to us, you know, proximate. A distant star far from anything else by such a name makes no sense.
And then there's the Ayn Rand-ness of this piece. The antagonist is apparently a communist, or so says the Mary Sue - in so many words. He has a desire to conquer the galaxy to solve all of it's ills - which is, of course, what all communists, liberals, left-leaning, progressive type people want. ALL OF THEM. Every single leftist in the entire universe is an idiot, says she, because we ALL want to conquer everything in the name of equality. And, of course, by extension, we ALL want to kill everyone who disagrees with us, because it's the only way.
Per the Mary Sue, the Federation of Planetary Systems (whichever government that is) and the Federation Congress (whomever they represent) exist only to protect private property rights. That's it. There is nothing else more important to the Federation than that. I have never heard that garbage before or since, and I have no idea why this novel was greenlit to be added to the Star Trek universe. This novel came out shortly before Star Trek IV and The Next Generation - like, a year before - and both of those seemed to pretty much solidify the Federation as the Socialist/Communist Space Utopia that we all know and love...not this libertarian wet-dream fantasy of this book. Kirk with his "there's no money in the 23rd century" and Picard with his "the accumulation of wealth is no longer the driving force of society" - both sentiments bandied about roughly contemporaneously with his novel and it's "Private Property is the be all and end all of the Federation"....
Also, the eponymous Dreadnought is stated again and again to be this unstoppable juggernaut capable of laying waste to entire fleets all by itself...and it's nearly defeated by three other starships in the climactic battle, so...(well, until Mary Sue tells the computer to do everything and it just does - her superpower is "can't someone else do it")...
And she never wears her uniform, because serving Starfleet Officers should just be allowed to walk around in sexy black skintight jumpsuits all day every day, right?
Did I mention that she almost beat the Kobyashi Maru test without cheating? Because she's just that good.