I purchased and watched all 3 seasons within about a span of 6 months, so my memory of the first (and second) seasons were pretty fresh on my mind when I watched this.
First of all, if you expect a lot of nudity in this season, you'll be disappointed. While there is quite a bit of male nudity, there is maybe 3-4 instances of female nudity in this season. If cartoon nudity is your cup of tea, you'd be better suited looking elsewhere (a bit misleading cover box - but that's marketing for you!).
This season had it's share of funny moments, but there were a few occasions where I literally got bored, which is pretty bad considering they're 20 minute episodes! I'm not going to dive into specifics, I don't want to ruin anything.
I assume the best advice I could offer; if you enjoyed the first two seasons, you may as well watch this third and final season.
Next on my watch list - Drawn Together: The Movie