I have used this tactic extensively in the past...
On one server I got caught by a Rom X Heavy Cruiser and I was in a battle tug.. pleanty of power.. lots of HET capability... slow movement, but armed to the teeth.
I had all weapons OL'd and ECM at 5 and ECCM at 1, WW at the ready.. I was closing distance at max speed .. all of 18.. just before I entered plasma range, I hit HET, but I did not turn the ship... I hit emer decel instead.. and ramped my shields up to max on the front..
My opponent mistook it as an HET Breakdown.. he came right on in ant tried to hit me with everyting he had at range 4.. I WW'd, HET'd again and started accelerating.. and knocked half his ship out at range 3 with all OL's.. Needless to say, I spent the rest of the mission chasing him until he left the map..
It is a viable tactic, but you do have to trick your opponent into it.. it is a gamble.. you have to really consider when to use it..but just keep in mind that this tactic will only work 1 in 8 times.. the rest of the time, you will get eaten up by your opponent if they stay back from ya.. most experienced pilots won't chance getting into OL range.. especially if they see that all your weapons are charged.