Aside from Tasha's poorly executed death, I thought it was an OK episode. It's Troi's best episode of season 1. Her and Picard's interactions with Armus were a highlight.
Funny that Spock's Brain is brought up as the quintessential "bad" episode. I found The Alternative Factor and And The Children Shall Lead to be on a completely different level of awfulness. Spock's Brain is tame and somewhat enjoyable by comparison.
I hate "And The Children Shall Lead". It's come to a point where I can't see even a part of it.