There is good and bad about them. I mainly avoid them best I can though, considering the lag they give me. You do often get quite a lot of mate beggars and when you call them all to one certain area then you get a lot of lag depending on how many there are. Judging by how Mate Centres work you can't expect the lag to go away any time soon.
"U come in da middle nao!!"
"Get out!!!! u had ur turn!!"
"CAN I GO IN THE MIDDLE NOW???"
"Nobody loves me!!!"
How it runs/works is what I don't like most about it. The player in charge calls another player to sit in the middle, anyone who wants to be mates with that character sits next to them. When you have others sitting next to you then you choose one and that's it, you're instant mates! Leaving the rest to wait for their turn again. You would only get a mate depending on your appearance.
I've never liked "insta-mates", it's like dating a stranger; not knowing anything about them. Actually it IS being paired up with a stranger if you think about it. In the end though, knowing how these things work, both players will end up not seeing each other again in the end and end up being mates with someone else. Plus Mate Centres tend to make a lot of spam in the chat.
They do however lower the amount of mate advertisements in the chat and random characters asking for mates, so that's a good thing as I would imagine.