There is not much I can say about Attack on Titan that has not already been said. The anime hits all the right notes for a lot of people no matter what genre you prefer. The action is sublime, just the act of the characters using the Omni-directional mobility gear is mesmerizing. Attack on Titan does such a good job of showing human desperation in their fight for survival against a greater foe. It does such a good job in fact that you may even come to fear the titans yourself. Knowing that there are things out there that the characters are yet to even imagine.
The story is also well written with lots of twists and turns that keeps everything fresh. Anime can get stale really quickly when the viewer is able to see what is about to happen or even predict the ending to a pivotal scene. Predicting this anime is neigh impossible at some parts, keeping you on the edge of your seat the entire time.
Attack on Titan is not a short anime by any means with 59 episodes spanning across its 3 seasons but if you can devote the time there is a lot of fun to be had.
My next comment may be controversial to some, but I really do not like fan service, especially on strong female characters. But this anime does not really dip its toes into this which in my opinion is a refreshing and welcome sight. There are enough diverse characters that anyone can find someone they connect with, although a word to the wise do not get too attached to people. This anime does not hold your hand, it lets you know that life is a hard thing especially when there are giants out to kill and eat you. Families are ripped apart and friends are left scarred and hysterical. One of my only criticisms about Attack on Titan is that it gets very confusing towards the end of season 3, missing an important piece of information could mean that the ending does not make sense. But don't let that deter you from watching it, because it is a great series and I think anyone who enjoys anime whether that be a veteran or a newbie will find something to like about it.
Also, the voice acting in my opinion is great on both the dubbed and subbed versions. I watched more of the dub as that is my preferred way to watch anime, but the Japanese voice acting is also well done for the people you enjoy subs more. Many anime have one or two dubbed characters that just sound all wrong, but Attack on Titan has great voice acting across the board and I would say that all characters fit there voice well. I know that a bad voice to character match up can ruin shows for me.
In conclusion Attack on Titan is a must watch that brings some much-needed variety into the enormous line up of anime.

Thanks for taking the time to read my review, this is the first time I have written a review for an anime or any kind of TV/Film for that matter. I hope that you found this informative and helped you make the decision to watch this anime. I would love to hear some feedback, so please feel free to leave some whether that be negative or positive. :)

Thanks, EO