[@NuttsnBolts] Allow me to maybe answer some of your questions:

[quote=NuttsnBolts]Do you look through the interest checks or are you happy with looking at established roleplays that you can enter at a later date?[/quote]

For me, it's both. This all depends on what one is interested in. Interest checks are mostly for those who want to earn a spot at the very beginning of the RP. Of course, this can still happen in a recently established RP, but one can still join in a more developed RP as long as it's open. Again, it's all based on how big your interest is for the RP you're looking at.

[quote=NuttsnBolts]Is formatting or structure something that you keep an eye out for? Or are you happy with an idea, however presented, as long as it's clear and precise?[/quote]

Eye-Candy always grabs attention. If done correctly and beautifully, it can gain a lot of interest. The more professional your OCC/intro is, and the more popular/interesting the idea is, the more the players become interested. While this isn't always the case, for the most part, it's pretty important.

[quote=NuttsnBolts]Does the reputation of the GM matter or are you willing to give each roleplay, no matter the GM, an individual chance?[/quote]

That depends. If you know the GM is a shite-lord, then maybe it's better if you look elsewhere. If the GM is well-known and well-liked however, then the more you'll probably enjoy the RP and be able to communicate with him more reliably.

Hope this helps. :) This also comes from a GM/Co-GM of several RPS both in the past and even now in the present.