I like roll systems in RP, but I hate straight-rolls where it's basically a coin toss, or along the lines of "oh, well I rolled higher than you, so I win." Roll systems make things interesting because they're reasonably unpredictable and they force both players and DMs to cope with the possibility that their plans won't always work out the way they want -- there will be hiccups and snags along the way. But the sorts of systems I've seen have either been so simple that I personally feel like the purpose of having a system to begin with is kind of defeated, or so complex that I couldn't reasonably expect anyone to even bother (because I, as a player OR a DM, don't want to bother; while I do want to get into tabletop at some point, I don't really want to put D&D into my FFXIV).
For me, the perfect roll system is quick to pick up and easy to adapt, but still goes deep enough that I can get an idea of what kind of skills, specialties, and weaknesses a character has at a glance. So I guess that means it's important for me to have something to glance at -- I know not everyone likes character sheets but I come from Tumblr and forum RP, where everyone's character profiles and sheets are not only laid out for everyone to see, but everyone who wants to RP with you is expected to read them. But it made it a lot easier for people who wanted to run plots to get a feel for what kinds of characters they were dealing with.
I also like roll systems because in my personal experience, if you give someone the freedom to choose, people will almost always choose to have their character succeed no matter what they say. And I hate that, because personally... Watching or playing with people who always gotta win isn't very much fun, especially if that success is unconditional.
For me, the perfect roll system is quick to pick up and easy to adapt, but still goes deep enough that I can get an idea of what kind of skills, specialties, and weaknesses a character has at a glance. So I guess that means it's important for me to have something to glance at -- I know not everyone likes character sheets but I come from Tumblr and forum RP, where everyone's character profiles and sheets are not only laid out for everyone to see, but everyone who wants to RP with you is expected to read them. But it made it a lot easier for people who wanted to run plots to get a feel for what kinds of characters they were dealing with.
I also like roll systems because in my personal experience, if you give someone the freedom to choose, people will almost always choose to have their character succeed no matter what they say. And I hate that, because personally... Watching or playing with people who always gotta win isn't very much fun, especially if that success is unconditional.