<hipster>Also, I used to play Ingress since it was still in closed Beta</hipster>
Ingress was better in closed beta. Actually, ingress was good until (a) they built levels beyond 8, (b) included a store, (c) had a portal explosion. It just got to be too much hard work to keep up with the teams.
I suspect that PokemonGo is struggling because of the issues that Ingress didn't have - there were only two teams, you were either breaking or building a portal, the battles were direct and interactive. In PoGo, there is a greater interaction with "gyms"
(i.e the number of times it crashes when trying to "train" at a gym, or take down an enemy gym is infuriating) and the spawning of creatures
- although it appears that the spawn is device specific - my colleague will not see the same pokemon as I do (i.e I might see diffrerent, or none at all, when compared to a friend standing next to me), GPS issues
(the GPS tracking in PoGo compared to ingress is horrendous - and losing GPS stops game play, in a way that is not applicable to ingress), screen brightness
(for ingress the screen is largely black).
Interestingly, I have noticed seasonal drift with my Ingress - in summer my GPS places me in a different location to in winter, by about 25 metres. Could be confirmation bias (given random drift throughout the day, but it does seem to have a noticeable difference as to which "portal" I can reach from my desk. There's a period of about 4 months (in two monthly intervals) where I can not reach either portal.