Very. Although you actually have to wonder how many people survived the war because of it. Many people surrendered when it lumbered into view against them, or later when they were covered in flammable liquid and facing a nasty end. The ignition trigger was separate for a very good reason, fed from a separate fuel source.
A horrific weapon when used to its conclusion, but combined with the AVRE it was a much safer way of taking out bunkers and fortified positions than an infantry assault alone. The AVRE would blow a hole in the fortification, then the Crocodile would squirt the jelly through the hole and wait. Net result a lot of people alive on both sides who wouldn't otherwise be.
Coming back to the thread topic, it would actually be interesting to see where that put the Crocodile in the eyes of the law. The main Crocodile equipment is only used to squirt jelly over large distance. The part that shoots flame is a separate tank next to the driver.