I feel like when I'm running on Weyland R&D or something, the difference between Priority Requisition and Hedge Fund is swingy enough. I don't understand why for Jinteki the possibility has to vary so widely, all the way from 3 point agenda to -3 clicks.
Most of the time a single blind R&D run isn't going to do much. You generally need to combine it with other things to boost success - getting an R&D lock, for example, is extremely powerful (this is where you access R&D every turn, always seeing the Corp's next card, and thus ensuring they can't draw Agendas without spending clicks to draw extra cards). Other ways to boost the effectiveness of running R&D is to use cards to access more than one thing at once (e.g. The Makers Eye, Medium, in the base set), trash lots of things out of R&D to try and find agendas (e.g. Demolition Run, especially combined with the previous two) or other various tricks introduced in expansions.
Jinteki are always the tricks and traps faction. The main thing with Snare is less the damage it will do occasionally when you access it, but the threat of potentially accessing it forcing you to have your hand size at a decent level.
Oh, and 3 cards is less than 3 clicks. Probably closer to 2 clicks. You don't HAVE to draw back up after hitting a Snare, and you will probably have ways of drawing more or drawing what you want to fill in the gaps, e.g. Diesel, Special Orders, Djinn. So the damage isn't really that huge. Add to that you can trash the Snare at no cost, removing one of at most 3 of them from their deck...