There are two ways to look at this episode. Depending on if you're in a good or bad mood.
1) A dying world sends out a beacon of memory to their civilization as a last desperate hope for their culture not to be lost to the abyss of time.
Or
2) A bunch of a-hole aliens brainrape Picard and keep him prisoner in some sick twisted little fantasy world for their own amusement. And then gloat about it right to his face.
I like this post most of all those others.
And to quote Grandpa Simpson,
A little from
column A,
a little from
column B.
It's a nice, touching even, little drama very well acted by the lead (Stewart), but it's dull and not very noteworthy otherwise. Certainly not worth of watching more than once.