DSKM-148 - Amateur girls getting turned on watching me masturbate

A popular, long-running series. While the quality is consistent, this installment feels a bit lackluster compared to previous ones. The cast still has that 'average-looking girl next door = amateur' vibe. Also, they feel a bit older than usual. Only the last two actually have full intercourse. I know it's not a series meant for the 'main event,' but when there's less of it than usual (the last few had 3 out of 6), it strangely feels like a rip-off. Would I recommend it? It's a toss-up.