ofcourse this makes characters with a flame weapon and cleanse and purify somewhat hefty but it directly relies on your enemies... fighting against eldar who are likely to be very agile it won't be the weapon of choice onless your WS is dumped beyond reason but it is not like getting a shooting roll of 120 if you have unnatural aim + PB +WS of 60... you can not push your flame weapon skill except for cleanse and purify (as far as I know)
I'll have to *meh* this one. A Dire Avenger Exarch has a 52 agility (*2 Unnatural). When playing without the IH rule for Unnatural attributes reducing test difficulty, that gives him a chance of 32% for not being hit by a flamer, compared to his 72% chance of not being hit by anything else (in addition to the chance of not being hit in the first place). For anything of un-eldar-ish dexterity, the numbers only get worse.
A shooting attack for 120% sounds rather... improbable for consistent results, considering it requires an enemy that lets you get into Point Blank without closing into melee outright and a psyker power.
And by the way: Shooting is governed by BS, not WS.
All in all, this makes flamers a lot more powerful. Probably among the most powerful weapons for semi-short ranges, considering they hit more reliably than most, don't need two rolls to deal damage, have no chance of really bad mishaps, can set an enemy ablaze,...
