First off, this is based off of a webseries. Regardless of it keeping the entire original cast or not (if you've ever read anything that got turned into a movie or show you know this is common), the way it is told is fantastic.
I can agree that the gargly and deep narrator voice is strange and sounds forced. Not a fan of that.
The animation itself is beautifully executed and the artwork is pleasing to the eye.
As a big fan of Saiki K I can promise everyone here who doesn't know what they are talking about, that this is very different and in no way a ripoff. There are 4 similarities. 1. Overpowered main character born with abilities 2. Main character is in high school or post-secondary school. 3. A love interest bothers the main character. 4. Main character is trying to hide their abilities from the world, but for different reasons than Saiki.
Not only are these abilities admittedly magical in this show, but the school is for people with these magical abilities, in a universe where it seems that everyone has the same abilities. The main character also eventually develops a returned love interest in the girl who fawns over him, and different universes are called into check, along with a brief hint that he might not be the most powerful being in the universe by the ruler of "the underworld" once the love interest is killed by the main antagonist, but the real-life concepts of the Big Bang, and space-time are also brought into play. The character does not have the ability to manipulate it himself, but needs the help of the Demon King to achieve a brief disruption to the laws of nature.
Needless to say, I'm very excited to see where they explore the love interest/assassination, the underworld connection to the love interest, the reason that the assassin is so over powered(as with hinted eye color coordination, it seems like she may be his mother) and what the heck is going on. We don't even know how this over powered "seven star team" came to be or why when the main protagonist went all out on the assassin, she could take it, but when he swatted her into the earth like a bug, she was somehow immediately incapacitated.
Not to mention, no one has ever said the words "immortal king" in the series so far...
There's a lot of unanswered questions!
I wish that others would get over themselves when they see a slight similarity to another anime and just enjoy the show.