As far as I joined, not impressed with Mingle2.com
1) Can not change my age range for dating(I am 33yrs young)
You can change anything you like here:
From a mobile:
http://m.mingle2.com/edit_profile
From a PC:
http://mingle2.com/user/edit_profile

2) messaging chat is not easy to find
That big orange 'Instant Message' is hard to miss on anyone's
profile, beneath their picture. (If it is NOT there, one of you
is in Stealth mode or has IM turned OFF.)

3) active females unresponsive/ Mingle2.com not notifying me of
new mail on my message section.
No one can be forced to communicate with you, if you need to
check where your notifications are being sent go here:
http://mingle2.com/inbox/mail_settings
Also, and this worked best for me and others, I placed this
in my contacts of my personal mail:
no-reply@mingle2.com
which expresses acceptance of any notification from Mingle2.
(Often your personal email will put notifications
in the junk email file.)

That said, really getting irritated being messaged by 40 - 87 year olds looking to get married.
I mean Wth? Mingle2.com, it should be on my profile settings. But, no? It's only in filter
matches that I have to enter every time I look for a date!? Really, can Mingle2.com just fix
this already?

The internet is easily accessible by anyone who makes the effort,
including scammers. That is why there are 'Block' options for IM,
Email and Nudges, once is all you need look at before blocking them.