The phrase "obvious flaws" refers to problems or mistakes that are very easy to notice or see. It suggests that the flaws are clear and apparent, without requiring much effort or thinking to identify them. Full definition
The most obvious flaw was some rough cut plastic I noticed around the base of the center console where there seems to have been no attempt made at all to create a finished look. (automobilemag.com)
Every once in a while a game comes along that is so much fun that despite obvious flaws I would gladly recommend it to anyone. (andymerrill.com)
But the lack of obvious flaws isn't what makes a game compelling; even a flawless game can be boring. (shmuplations.com)