Hi Joshii,
I'm on a couple of other sites as well, and I sort of see the same picture as you. I believe you can name the sites freely here, I'm on Cherryblossoms.com, did a short try on Chineselovelinks as well but didn't pay for their service yet.
Yes you will get chatters, you'll give them free English lessons ... and you find real and fake ones just like anywhere else, so beware of scammers. Dateinasia is pretty bad there but then all the sites where women can join for free are, it's not a Chinese thing, it's the same here in France.
The reason why you like Chnlove is that either you get a convincing fake (translator writing to you), or you get a real one who is serious and motivated since she paid a high fee to register with her agency and has decided that marriage abroad is what she wants. On the free sites, many women will play around, and so do many men, a lot of it is just entertainement. Then again you find some agency profiles on these as well.
So Chnlove is mostly good if you don't have or don't want to waste too much time, also the choice is broader since women without any English (vast majority) can be reached there, and usually a bit better average social class because of the high fee required on their side.
If you have enough time, play both sides and focus on the person you find and like rather than the site she uses.