Spent a good hour trying to beat that Spider thing until one dude in my crew up and quit. The entire squad died about 6 times and had to restart the fight over a 35 minute period before we came up with a decent strategy and brought dudes health down to about 15%. That took about 25 minutes. At that point, Spider tank wipes out my two teammates at the same time, then wipes out me.
All I could do was say 'no' over and over again. That's when one of my teammates left and then I left because two level 6's weren't taking that thing down alone.
This game is awesome