Since there are many good ramen joints in Toronto, it can get hard to chose the best one out of all. In the end, I believe that it all depends on the preference. I am not too picky about ramen as I can't really tell the huge difference anyways unless I order exactly the same thing from different places.
Raijin Ramen offers good ramen overall, and I like how it is very spacious compared to other major ramen places in downtown. If the line-up is too long for Sansotei or Santouka, I recommend this place as an alternative. The location is convenient too for those who are shopping in Eaton Centre. Service is friendly but a bit slow although the place was not packed.
Overall, good food and good location. I haven't seen a line-up for this place yet so if you are not patient enough to wait for other ramen places, just go to this one!