のが下手へた

のがへたno ga hetaneutral

savor + bad at doing

ajiwau no ga heta

bad at doing

meaning: is bad at savoring

弟おとうとは料理りょうりを味あじわうのがへた。

otouto wa ryouri o ajiwau no ga heta.

My younger brother is bad at savoring food. neutral

私わたし、片付かたづけるのが下手へたでさ、部屋へやがすぐ散ちらかるんだ。

watashi, katazukeru no ga heta de sa, heya ga sugu chirakaru n da.

I'm bad at tidying up, so my room gets messy in no time. casual

All examples3

bad at doing — の turns a verb into a noun for 下手へた to grade

弟おとうとは料理りょうりを作つくるのがへたです。
otouto wa ryouri o tsukurunogahetadesu.
My younger brother is bad at making food. neutral
私わたし、片付かたづけるのが下手へたでさ、部屋へやがすぐ散ちらかるんだ。
watashi, katazukeru no ga heta de sa, heya ga sugu chirakaru n da.
I'm bad at tidying up, so my room gets messy in no time. casual
昔むかしから人前ひとまえで話はなすのが下手へたでした。
mukashi kara hitomae de hanasu no ga heta deshita.
I was always bad at speaking in front of people. neutral

苦手にがて is a softer neighbor: it reports not liking something, not skill (納豆なっとうが苦手にがて). 下手へた only judges skill, so ×納豆なっとうが下手へた is wrong.