A good episode. Not a great plot, but plenty of action, phaser fire, enemies being blown up, Ryker being trapped, the Enterprise attacker by an undetectable foe and having to split in two, Bevs being hurt all make for some great TNG action.
Its still gets a lot better, but this is one of the earlier episodes that shows the direction of the combat oriented episodes. Dialogue matches the quickfire pace of the action.
Main highlight is Ryker being disabled by a forcefield and Jordi having to command the Enterprise while both Picard and Ryker are on the planet. He also takes control of the battlebridge in a last gasp attempt to save the away team.
This is classic StarTrek, if only early TNG!