The Arrow had the potential to be an excellent interceptor (and Avro-Canada had some concepts for ballistic missile interception, too) and, quite possibly, a good strike aircraft (there was such a derivative proposed to Britain's GOR.339). I could see it, too, as an excellent recce platform (intend to model one that way using a RF-111 recce pallet). That would be quite enough if it had been developed. From all I've been able to gather, the Iroquois was in advance of both the J75 and the Olympus 320R (for the TSR.2) and it's established fact that an Iroquois engine did wind up in the UK. Was it all-doing, no; was it an excellent aircraft that deserved better, yes IMHO. Certainly it gives plenty of room for whif fodder. I can't, though, see it as a tactical fighter along the lines of the F-15 or F-14.