First, the software, it has a non-intuitive interface that is quite cumbersome to use. It errors out frequently, for example; when you get matches by email and click a profile link it always returns a "Internet Explorer cannot display the webpage" message unless you are already logged in, it also frequently errors out when you move from one page to another, particularly annoying when you have spent time composing a message and it loses the contents.

Additionally, the system supposedly protects your actual email address but I have found numerous times where it actually forwards the profile's address in an improperly formatted email header.

The system is very slow at updating profile statistics like how many views and who has viewed your profile. For example, it is quite common to get messages from members who according to match have not even viewed your profile.

The search also brings up odd results when you change the "order by" criteria, for example, you say go from original order to latest activity date then back to original order and the profiles are listed completely different than the first time they were ordered "origianlly". Calls into question the entire search methodology.

Overall, the software is very poor.

Second, the database, there are a lot of members, however female profiles get an order of magnitude more traffic than male profiles. I have communicated with dozens of members of both sexes and verified that a typical female member gets at least 100 times more views and messages than a corresponding male profile. So, good if your a woman, not so great for men. Additionally there is no mechanism for verifying simple things like members ages, consequently many, many members lie about their age rendering the searches unreliable at best.

Members also receive many winks and messages from bogus profiles which are apparently involved in some sort of email address mining activities, again, there are simple safeguards available to prevent this but Match.com fails to employ them.

Overall, that the database is large is about the only good thing you can say.