常见

常见 means common or often seen. It describes things, not what you do. If you often see him, say 我经常见他. 经常 goes before the action 见. You cannot say 我常见他, because 常见 is not an action verb.

In 我们常见面, the break is 常 + 见面. 常 means often, and 见面 means meet. 常见 alone means common or often seen. So 我们常见面 means we meet often. 我们常见 alone means we are common, which is not what you want.

常见 describes a situation or thing that is common. To say it is not common, use 不常见. 没常见 sounds wrong because 没 usually talks about actions that did not happen. For a plain description, use 不.