Lvl 30 Soldier
Post suicide mission

This is where Arrival has a chance to shine a bit with the minor stealth element - using non linear paths to sneak past guards rather than fight them. Though I stress the word minor since it's Shepard we're talking about here and there's no real loss in going guns blazing. When Kenson is located she becomes a temporary party member while they escape the prison. There's nothing new going on here aside from a part where you have to protect Kenson while she hacks a console.

Only real grief is that it just doesn't feel like the DLC to sign off on Mass Effect 2 with. It didn't bring the emotions we were given from Lair of the Shadow Broker, the various environments from Overlord or even the quirky exclusive gameplay from the cocktail party in Kasumi's Stolen Memories.
Arrival is an adequate DLC. It's not great by any means but it's not bad either. Though I did expect more than the 1 hour and 10 minutes it took for me to cruise through, including all dialogues and questions answered.
If you feel you can wait, I recommend doing so. If it was possible: You could pretty much buy it and finish it while Mass Effect 3 were installing to your harddrive. It's just a bit too short to recommend day one purchase.