I've had mediocre luck with seeds this year too.... Maybe a 30% survival rate, at best. I say survival rate because I've had quite a few that sprouted but then don't thrive or grow well. I've had to supplement with purchased starts too....Due to my pitiful germination rate on the shorter season (58-65 days) tomatoes, I have an open row in my garden. I might fill it with purchased starts, or maybe something else from seed. Or maybe a bunch of onions.
The very best germination rate I had was my own saved seed from my Amish Paste. 19 for 19, and the plants look good. The second best was also saved seed from a friend, Cherokee Purple (never grown it before) and it was 7 out of 9.
The seeds I purchased were at BEST 3 of 9. And some of them I planted twice, so it might be 3 of 18.
I really hope some of the purchased seeds do well, tomato-wise. I'd like to save seed from them and have more tomato diversity. I want some determinate varieties that produce big tomatoes for canning.