If I had to describe this anime in one word, it would be "boring". It was kind of funny at the start, and I liked the concepts on paper. Monsters being not so bad, telling the story from their perspective, and something like looking for a house in another world where fantastical locations could be explored! But it felt like after they went to the spooky mansion and the whale, they ran out of ideas. Then there's also the issue of a bunch of this anime being dedicated to stuff like paying taxes. If there's an audience for that, it certainly isn't me.
Sure, Letty is cute at times, but as the series goes on he doesn't develop at all. It becomes pretty frustrating. When he started protecting the egg I expected him to eventually improve himself to protect someone he cared about, but the egg ended up being nothing more than an excuse to add a cute mascot character to the cast. I wanted to see him learn the skills he never learned with his parents, such as fire or flight, but that never happens. It makes Letty seem really whiny when he doesn't have any growth, but the jokes at his expense also start to feel repetitive at this point. We get it, he's a dragon who's also a weakling.
In fact, the message of this anime falls flat in the end. "Every being has good and evil" and yet certain races such as the dwarves (and 99.9% of the time humans) are just pure evil and want nothing more than to butcher Letty for his valuable dragon parts. Everything about this anime unfortunately just started to repeat itself after about 5 episodes that it was very hard to watch through all of it. If you want to check it out, I recommend only the first few episodes as that's where it shines the most.