I somewhat agree on your comment about documentation and UI (altough once you get used to it, it’s manageable) but just to add with my experience on these things: for me they’ve been rock solid. I’ve used them both at home and professionally (mostly on small-ish networks) for at least 10 years and they just seem to run just fine.

Currently my home router is RB4011iGS+ and there’s been absolutely no problems with it in the 4-5 years it’s been on my network. I’m not saying all their models are as reliable and there’s not that many models I’ve had my hands on, but my experience with them has so far been pretty good.