Same experience, right down to how the match quality holds up past the first day.
My rule for it now is simple: check whether people reply or just collect matches on day one.
I gave the app about 5 weeks before I formed a view, mostly watching whether the good profiles are already taken.
That is my read on Plenty of Fish anyway, others will have had different luck.
I had a better run on DatingFly's free tier, for whatever that is worth.