〜だけに

期待(きたい)していただけに、残念(ざんねん)です。

Kitai shite ita dake ni, zannen desu.

I had my hopes up, which makes it all the more disappointing.

だけに means all the more so — the first term amplifies the second

プロだけに、仕上(しあ)がりが違(ちが)います。

Puro dake ni, shiagari ga chigaimasu.

You can tell a professional did it — the finish is different.

What follows may be good or bad — unlike ばかりに

若(わか)いだけに、回復(かいふく)も早(はや)いですね。

Wakai dake ni, kaifuku mo hayai desu ne.

Being young, they recover quickly too.

The first term is a known attribute; the second follows naturally