The Central West and Country representative set out to end his time in the top grade Sydney colts competition on a high note but came up short in the Marlins' 41-24 semi-final loss to Randwick.

Quinn's two seasons in the Marlins colts has been made all the more enjoyable by the presence of former Country teammates Yool Yool and Hunter Ward plus the addition of Dubbo Kangaroos man Patrick Berryman.

Quinn scored a try in the Marlins' loss on Saturday while Yool crossed the line twice but Randwick, as they had done earlier in the season, had Manly's measure.

The flanker said the strong country presence in the club is great for the club's atmosphere.

"It definitely creates a good atmosphere. We had more than 10 players who would be country boys - from areas like Maitland, Tamworth, Orange and Bathurst. That's really changed the whole culture of the club," he said.

"We had all three of our colts grades make finals this year and living with all the country boys brings us closer together, and that shows on the field as well.

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"I'm now playing with three guys I used to play under 15s Central West with and now we're all 20 years old and living in the city playing rugby together. Having them around really helps."

Manly may have missed the grand final but have a great season of rugby to reflect on.

They started the year with five straight wins - including a 120-0 annihilation of Western Sydney - before suffering a tough seven-point loss at home to Randwick.

Manly went down 55-52 to Sydney University in an entertaining, high-scoring contest at Coogee Oval a week before the rematch with Randwick.

Unfortunately, at the same venue, the Marlins couldn't score revenge.

Quinn said over the course of the season he's been able to take his game up another notch.

"I'll see where things go from here. If I do end up staying then I would have a look at aiming for first grade next year," he said.

"My rugby's come along really well. Compared to my ability when I was playing in Bathurst my game's come a long way.

"I've been lucky enough to have been selected as the colts club captain to represent the whole collective. You also get exposure to training with the first grade guys.

"The older guys take you under their wing. It goes to show that being subjected to that high standard of rugby can help you go a long way."

Randwick will face Sydney University in the grand final after the blue and golds beat Gordon 43-10 in the other semi-final.