I do not know Civ IV, but Civ V is so easy I could beat it easily with no prior experience of Civ games (I was building roads half way through the continent until I released you can connect cities to capital via harbors and didn't create a single warship until late game) and still got bored till the end in the first play-through so much I declared war on everyone so something happens. They all lost the war by the way.
This has no relation to my comment...I did not support nor criticize any game of the civilization franchise, I merely pointed out that the existence of complainers does not make a game bad nor does it inherently point to the flaws of a game...
But since you brought up the difficulty (or lack thereof) of Civ V, why not continue that discussion...it is quite convenient you leave out the difficulty level you played on, and since it was your first game, one must wonder just what version of the game were you playing? For all I know you were playing on settler with the launch version of the game...
Regardless, we still can answer the question: is the Civ V AI flawed? Sure it is, just like the AI of every game...
Galactic Civilizations 2 -- AI totally inept at defending against culture...poor logic with many of the new buildings introduced in Twilight of the Arnor...few AIs would even bother putting defenses on their ships till late game...some of the AIs wouldn't even expand beyond a few planets regardless of map size (Drengin worst violator of this)...AI easy to dupe in trading research...had no concept of transporting population from core to frontier worlds, etc. etc. etc....and this game is considered to have one of the best AIs of any strategy game...
Sins of a Solar Empire -- AI totally inept at fighting starbases and largely incapable of handling titans...AI expansion is terrible, even on highest difficulty you can out expand the AI with ease...AI use of abilities is mediocre at best, and appears to have no strategy in selecting capital ships...AI logic for determining whether to stay and fight or run is awful, and it will routinely suicide large quantities of ships for absolutely no reason...AI becomes utterly broken after so many minutes of play time, not making use of diplomacy and not researching any additional technologies...AI fleets can be held at bay indefinitely with kiting scout ships and trade ships etc. etc. etc...and this is considered to be the best 4x space genre game at the time....
Rome 2 Total War -- AI struggles to assault any structure, letting units stand indefinitely and do nothing or letting go of siege equipment and never using it again...AI armies will suicide into enemy territory and leave themselves open to ambush...AI struggles to build anything beyond low tier units unless you do it a favor and totally wipe its army late game (and let it live)...AI is pathetically passive, letting you expand at will and not giving a care in the world...AI often starves itself to death and doesn't know how to solve the problem, crippling it until it is eliminated and absorbed by someone else...and this here is the flagship title of a AAA studio...
Europa Universalis 4 -- AI is totally inept at executing amphibious assaults....AI fails to recognize growing threats and lets nations eat the whole world without doing anything to stop them...AI is a terrible ally in wars, often suiciding armies for no reason or refusing to reinforce key battles one province away for no reason....AI can be tricked time and time again to attack in unfavorable terrain...AI is terrible at using its navy, often losing whole naval arsenals despite having overwhelming numerical superiority...AI is poor at developing its economy, preventing it from fielding decent armies late game...and this here is the flagship title of a highly successful studio...
The only strategy game that has good AI is chess...anything more complicated than that, and the AI will always be problematic...even the "good" AIs bank on cheating in order to compete...in GC2, AIs can see whole map without the need to scout...in SoaSE, AIs get technologies instantly before they even have the labs and can upgrade capital ships to ridiculously high levels...in EU4, the AI gets extra diplomats, never has to worry about colonies being attacked, and knows the move orders of all your units....this ignores the cliché economic bonuses AIs get by raising the difficulty...
The Civ V AI isn't any more problematic than the AIs of other highly acclaimed strategy games from prestigious studios...that it sucks points to a limitation in gaming technology, not a flaw with the game...Civ IV had AI issues of its own, they just weren't primarily with the combat system which tends to get more attention than other aspects of the game...
Do not be afraid of constructive criticism no matter what the topic is: there are places in the world where you can go to work-camp for having them thus the opposite does not necessarily bring happiness and satisfaction.
Fear of criticism is not the problem....using the existence of criticism as evidence that a game is flawed is the problem because there will always be criticism...one should be wary of criticism that Beyond Earth is just like Civ V when there was also criticism of Civ V for NOT being like Civ IV...I'm not saying the criticism is wrong, but it certainly isn't right just because it exists in large quantities....a lot of the criticism for Beyond Earth and GC3 are philosophical differences and NOT actually issues with the game...you don't criticize chess because it isn't colorful enough just as you wouldn't criticize Candy Land for not having deeper strategic thinking....