They reject seemingly at random however you can usually get them reversed. I wish I knew this earlier as I likely have about 50 rejections from them as well, probably more. I have 2 from this week I haven't had reversed which is a bit of a concern as they usually do reverse them quickly. I sent polite messages right after the rejection asking them to double check as I am extra careful due to past rejections. Once I found out they mostly listen to reason I have gotten a few overturned.
The pay does suck for a lot, but often there are some real easy ones. The ones that are just multiple choice or the 1 cent ones often consist of hitting blank, black and then submit. If everything loads quick 5 seconds. Still you're never going to make any real money on this but if there is nothing else happening, or you want to round off your numbers it's better then nothing most of the time. If there wasn't the constant worry of random rejection I'd rate them higher as this is a much bigger problem then the poor pay. I would also avoid anything that requires you to type more than a couple of numbers.