You will always need a certain level of tolerance, I guess - but going by the reviews I read this really isn't a show I'd suggest to someone watching anime for the first time ever.
Are you sure they didn't want to troll you?
The thing people need to learn when suggesting shows is considering the show they actually recommend. - In that dragon thing's case the art style along dejected me from ever watching it.
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General:
And if anyone wants to pick Animes, pls use this here
https://www.livechart.me/winter-2018/tv
Not only do the tags tell you what genre the story is set in, but it also has a synopsis that can help decide whether a particular show is interesting. (And even then, there is still the 3 Episode rule)
You guys should ask him what kind of Series he likes first.
Grimgar, as awesome as the story might be, has a horrible pacing and is more of a prologue than anything else.
if you want to suggest someone a fantasy story I'd also rather start with the fate series if I were you. - There is a reason it has so many seasons you know :/