To be fair though, Mortarpod comes down a turn earlier, when you actually might want to kill a 1-toughness creature, and comes with a free red shirt. It was a sweet, sweet limited card in its time (3 years already?), in part though because it worked so well with infect. If you run enough X/1's and support a sacrifice theme I suspect it's one of the better options still.
There are other scenarios too where the card is randomly better than it looks. Like one time where I used it as fodder for a braids. For 2 mana, I got two things to sacrifice to it which carried me to victory (while my opponent was sacing shit that mattered). I've also used it to pump a dude while pyroclasming the board (it gives +1 toughness when equipped which many don't even realize).
That type of stuff is clearly not going to come up every game, but it's all stuff blasting station can't do (even if the station is more efficient).
One thing that I think is very true in Cube and less true in some other formats is how valuable having options/answers is. Every card that comes down is potential game warping. Not sure how many rares/mythics make up the typical cube, but I'm well over 50% I think. Every card that gets played is potentially something that has to be answered quickly or you just lose. So even inefficient removal options are playable a lot of times. I'm all about losing two tokens and wasting 4 mana to kill Sower if he stole my win condition. It just needs to happen at whatever cost because I will flat out lose if it doesn't. At that point 6 mana is a fair price if it's the difference between still being in the game and just dying next turn.