Actualy, if you think about it, that's a pretty formidable weapon...If there's a lot of lag, go into an enemy base and start shooting...Everyone'll be too busy warping to repair anything!

But stealth tanks seriously are better. The flamer has high armor because you can see it coming, and it will likely have only half health by the time it reaches a target(with a good defense). A stealth, on the other hand, can run circles around a base looking for the perfect place to hide, THEN let loose. Provided they stay in an area where the shimmer won't show, it's hard to detect them. And, if you have someone stand near the door of a building, if you aim right it's just good enough to hit the MCT...

And stealth tanks OWN mammoths/mediums/mrls...

So why don't people use them more often? Beats me, maybe they prefer being teleported all over the map?