To a large extent yes. I don't think it's that well written, but it contains a heck of a lot of ideas.
and it is those ideas, presented as the background for the story, that make it such a classic.
for me, SF is at its best when it does cause controversy.
what many fail to realise (present company excepted) is that the author is playing in the worlds of "what if?" and the views expressed by the characters in the book aren't neccesserily those of the author.
in a more popular and commercial story (such as Star Wars) the villains are human and their motives are negative human emotions. The Emperor is motivated by a lust for power. this gives the rebels a nobility in their actions.
in ST the situation is a moral quagmire. the Klendathu's emotions are totally alien and they can't be bargained with, there is no chance of surrender or capitulation, leaving humanity, and therefor the hero, with no choice but genocide.
this raises the question "is genocide ever acceptable?"
most of us want to answer "no" but ST presents us with no other alternative for racial survival in a universe containing Klendathu.
then there is the political hegemony where only those prepared to die to protect the Earth and humanity have the vote, but those who aren't prepared to serve and become veterans still benefit from the protection of those servicemen.
RAH has a very poor regard for pacifists and the political situation of ST forces the issue in a very black and white way.
if you want to vote, stand up and be counted.
as a consequence, there is no need for conscription, even when the armed forces are faced with an enemy that knows no fear, has no regard for the individuals in their fighting force and will never capitulate.
the book forces the reader to make some very unpleasant choices and this is where I feel it gains its critics as either option is unpalatable but the situation calls for a decision to be made (although signing up is probably an esier choice as eventually you will have to face this enemy, but at least in the MI you are given weapons, armour and training and have a chance to defend yourself whereas a civilian would just be a minor distraction with a life expectancy of seconds.)
this is why RAH is so re-readable. as you go through life, your experiences change the criteria you base your answers to those questions on, even if the answers remain the same as they were when you previously asked yourself those questions