I think reviewing a tech product/service is (or should be) fine. It only turns into a 'support ticket' if the review is negative and the provider of that service comes on here to defend themselves, which isn't really the fault of the original poster.
Radar started as a forum for actual important tech conversations in Nigeria and most of Africa, yes - and "Is tech product X living up to its media hype? Do they have excellent support?" is an important tech conversation as far as I'm concerned.
I personally like these crowdsourced reviews because I'm learning what services to avoid and which ones work well (e.g. based off of recent topics, I've learned that Alat and Tizeti seem to have subpar support, and as I don't like signing up for things, I'm more likely to buy from Jumia until Konga enables guest checkout, etc).
Fwiw, I agree with Points 2 & 3, but I'm curious to know why you think the 'support ticket' conversations are not worth having here.