Just for fun, as this came up last week...which one wins.
I don't have the books with me but in short; the mimic automatically wins grapple attempts (no dice rolls) and freedom of movement lets you automatically escape grapples.
So which automatic success is better?
I at first thought that the Mimic automatically grapples on its turn and then on your turn you use your Ring of Freedom of Movement to automatically escape. The ring is based on the Freedom of Movement spell. The spell says "All combat maneuver checks made to grapple the target automatically fail." The Mimic isn't making a CMC to grapple, it just happens as a consequence of a successful slam attack. The Mimic's description then says "Opponents so grappled cannot get free while the mimic is alive without removing the adhesive first." So the target doesn't *GET* an escape artist check or CMC to escape (so the spell can't make them succeed) unless the glue is first neutralized.
So now I think that the mimic glue wins over freedom of movement.
How then does a single low-ish level melee character beat a mimic?
Sidenote: Do natural attacks have a chance of getting stuck?
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The more I read this ability, the more confusing it becomes:
Does the Mimic need to maintain the grapple? Even if the creature can't escape?
Does the mimic retain the grappled condition even when not maintaining a grapple?
If it grapple one target with its slam, can it grapple another?
Is the slam stuck in the grapple with the first target?
Can it move to pin? Does it need to maintain the pin?
When does constrict apply?
Here's an answer to some of your questions: http://rpg.stackexchange.com/questions/33414/mimics-adhesive
(Summed up: doesn't need to maintain, does gain grappled, can continue to damage as part of the grapple and other attackers can get stuck, too. As many as can reach it.)
In other contexts where I've seen autograpple at least the other (if they're good at it) can turn the grapple around and gain control. Here given that it's just glue, I don't really see how that would work... Someone pinning the thing that he's glued to? Heh.
Anyway, screw underleveled and solo - how does one beat these things in melee at all?
First guy rushes in, attacks, weapon sticks. Thing slams, he's stuck. Pulls out his dagger and hits, avoids getting stuck once or twice, then it's gone to. Meanwhile second guy gets slammed by the thing as well. With both stuck (occasional break free weapon, only to then lose it in the next attack that hits) they're just being slammed around until they're done...