I'm reasonably happy with Lunar Pages, for a low cost host. There are some times when it seems like the server I'm on gets bogged down or offline, but probably no more than most, where only one server is serving. They've had growing pains, and it took me some effort at times when I was setting up to find the tech support guys that could actually help. The e-mail support can work well once you get a response. It's proably 4 times the size now than what it was when I joined about 2 years ago. At the time though, it had some of the best serve times for low-priced hosts. I haven't made any real config changes since I started so, I haven't had to deal with them other than to remember to keep $45 in the account every 3 months.
I had zero problems installing mediawiki (1.39) a couple of months ago. (Well, that's not true, I tried installing it into my alternate mysql database, had some problem, and then tried installing it as an add-on to my main db and whatever I did different worked, and I've been too lazy to re-install. But I didn't need to get the host to do anything.
I did have to get them to set my account to use an older version of their "control panel" skin, to get myphpAdmin to work correctly. And their were issues with using a nonstandard port to use that control panel. (Which keeps me from using it at work, our firewall has all non-essenitial ports blocked.)
James Birkholz admin, Posen-L mailing list and website http://www.Posen-L.com