Play Gin Rummy Better -- What are Good and Bad Gin Rummy Hands

Discussion below proceeds with the assumption that a player selected a purely offensive gin-rummy playing strategy concentrating on maximizing own hand chances instead of minimizing opponent's chances to win this hand.
In other words, a gin rummy player who elected offensive play tries to build own hand so as to knock or gin as soon as possible during the minimal number of pick-up/discard steps keeping all melded combinations and discarding unmelded cards.

Purely offensive Gin Rummy play presumes that there's no analysis of opponent's hand or opponent's pick-ups or discards.
From the standpoint of offensive strategy, there are poor card combinations and good card combinations. A table below shows typical gin rummy card combinations arranged from poor to good as far as maximizing their melding opportunities.

K Q	King and Queen combination of any suit is a poor combination because you'll have only 1 card (Jack) to meld it. To make it worse, this combination gives a whopping 20 points in deadwood.
10 Q	Another poor one-suit combination with the 'hole' in the middle. Also you'll have only 1 card (Jack) to meld it and unmelded it still brings 20 points in deadwood.
6 8	These 2 central cards give a slightly better combination and carry less deadwood (15 points)
A 3	Although there's a similar hole in this 2-card combination, it's better because there's very little deadwood that it carries (4 points)
Q Q or 7 8	Better 2-card combinations as there are not just one but two cards in the deck these combinations can get melded with.
3 5 7	Although this 3-card combination has 2 holes in it, there are two possibilities of melding it
6 8 8	this 3-card combination allows three possibilities for melding
10 J J	this no-holes 'triangular' 3-card combination allows 4 possibilities for melding
5 6 5 6	this 4-card 'rectangular' combination allows 8 (!) possibilities for melding