what are you talking about snare on the 3 / what "constitutes" dubstep tempo? bird, seriously, do you even know what tempo is? kick on 1 snare on 3 is just a drum arrangement, it can be done at any tempo.
dubstep's tempo is 70/140. sometimes people mess around up to 75/150, ive heard as low as 60 on rare occassion, but 99.9999999% of dubstep is made at 70/140 and if it's anywhere outside of the range of 60-75 / 120-150 it's flat out *not dubstep.*
electronic music is largely classified by tempo. for instance, have you ever heard a drum and bass tune at 120bpm? i'll answer for you: no, you havent. take shy fx's nuttah, one of the most popular jungle tracks in history, slow it down to 120bpm...it's not jungle anymore.
some common tempos for reference:
house: 120-130
dubstep: 70/140 depending on how you want to time it
breaks: 130-140
dnb: 170-180 (usually 175 on the dot)
glitch-hop: 85-100
midtempo: 100-110