Sorry for the double post but if anyone is interested to hear my point of view on the matter regarding Ra (since many people are doing this), it feels as though it's the kind of character you simply have to associate the sentence "Easier said than done" regarding weakness. 
I'm pretty ure any AoE Jutsu would finish off Tendo (Deva path Pain) rather easily as long as it's within the five second cooldown. But yeah, even by being creative this is hardly possible without specific tools to handle the situation. Especially if the user is skilled. 

I personally do not like genjutsu, but I don't mind it either. But I do think it's ridiculously OP when used by skilled users like Tuuj. That said, anything can be OP if one is skilled enough with the technique.