>>5939743My first set was the AA turret with three Spartans, all the way back in the first wave. The piece quality wasn't where it's at now but I was sold on the awesome minifigs, even with their clunky SMGs (that have since been redesigned). After that I got the Warthog and almost every set since.
Can't speak for Destiny sets as they don't interest me but the CoD ones are definitely worthwhile, the interchangeable weapons are great and the sets are generally well done.
