Having stuck with it a while the ones with a paywall have improved the filtering a fair bit, and that alone put me off. What are the best paid dating sites. If your inbox is dead, report the obvious fakes rather than ignoring them — it saves a lot of wasted evenings.
Also seen Ezhookups.online pop up in a few comparison threads recently. After a slow start I noticed the reporting system behaving differently on the forum-style sites, which changes the whole experience.
Judging by my own inbox, if you are after something serious the answer is usually to write a profile that gives someone something to reply to rather than avoid opening with a compliment.