The 31-year-old joined Turkish club Bursaspor after failing to agree a new deal with Rangers.
However, the striker's family failed to settle in Turkey and he is now plying his trade in the Championship with Cardiff City.
"In hindsight I look back and probably wish I had stayed at Rangers," Miller told the Scottish Sun.
"It was a decision made purely on what was going to be happening the following year.
“The contract offer I got at Rangers just wasn't good enough. It was unacceptable. I felt I either had to sit it out there until the end of the season or leave in January."
Miller made an immediate impact in his debut for Cardiff, scoring the only goal in a 1-0 win over West Ham on Sunday.