"It's a matter of degree, right?"とは、「それは程度の問題だよね？」と訳せます。
二番目の"It's all relative, don't you think?"とは「すべて比較対照だと思わない？」という意味です。
例文：
"Well, these cookies are definitely sweet, but again, it's all a matter of degree, I think."
"Depends on how you see things. This job is hard, but compared to my last job, it's easier. It's all relative."
アメリカ合衆国 
