Took down my first raid tyranitar today. I was watching a level four due to hatch around noon and when a tyranitar popped out, I ran towards it, but was disappointed when I got there because I was the only one in the raid lobby
one person joined, but we both bailed the lobby before the battle started because doing it with two would have been a waste of time and resources. Eventually we had 5 or so, and we tried but it ended up with only four of us in the battle and we lost. At this point about twenty minutes had passed, and two people walked up. My phone kept crashing (this has been a common annoyance since the update, anyone else experiencing this?), but I finally made it into the battle with twenty seconds gone. We beat it with relative ease with 8-9 people with most being less than lvl 30. No TMs unfortunately and only 8 balls to work with. I decided to go golden raz and caught it on the first throw (everyone wasn't so lucky).
Some things I've noticed in my area with the raid system- level four raids with tyranitar, lapras, snorlax and occasionally charizard seem to attract players, but it takes time. I would say 15-20 minutes into the raid is the prime time to get in. A lot of these people are in text groups and it takes them a while to get there (also, loser spoofers take a little while to spread the word before they finally teleport)
Blastoise and venusaur aren't as popular...multiple attempts and never got enough people. Level three raids are almost a lost cause. I would love some high IV alakazams or machamps, but no one wants to raid them and I can't do it myself. I don't bother with the eveelutions, so not sure about them.
Level one and two are obviously doable solo and a good way to get high IV muk or a good qulava/bayleef/crocanaw to evolve. Finally got a good quilava for my typhlosion that way after catching probably 100 cyndaquil during the fire/ice event and coming up empty.