On the bright side, the disks both look to be in okay condition (slightly scuffed, but I'd imagine they'll work fine), and the box isn't in bad nick. There's nothing in the box but the two disks (i.e. no instructions or online pass) but that's to be expected with second hand games. If you get them it's a bonus.
You made the right choice. Saints Row 3 is a decent game but nowhere near as good as SR2 (imo), whereas you know exactly what you're getting with the Lego games.
Was toying with getting Far Cry 3 on this deal, as well as AC3. Should be possible to use the code more than once so long as you make a new account each time. I think I'll leave it for now, though, as it'd just be sat on a shelf for a few months - by which time I could probably get it brand new for around the same price.