Which rpg has the best combat for you?
All the ones I'd name are turn-based and some of them are blobbers, so they don't really count when it comes to this matter. But I can say so far that I've had much, much more fun in both IWDs and in BG2 when it comes to combat (maybe BG1 too, but I played that one so long ago that I can't remember shit about it).
I would even risk saying that I had more fun in Storm of Zehir than in PoE.
Which rpg has the best character system for you?
I honestly can't say, because I've never thought about it.
I could, however, provide by contrast a whole bunch of character systems that are really weak, but which I still find better than PoE. And this even includes the ones from Original Sin or SRR. Even SPECIAL was better than this, in spite of how broken it was.
To put it simply enough, everything about the character system is just samey as hell. There's nothing fiddly about it. There's nothing cool about it. Going up a level doesn't make you go "squeeeeeee~", all it does is make you go 'oh, some more numbers'.
Which rpg has the best writing for you?
This is not just about rpg writing, this is about fantasy writing in general, and PoE falls into the pitfalls of just about every c-grade fantasy wankfest out there. Not only are most of the texts way too BLAH BLAH BLAH BLAH for their own good, but what probably kills the writing for me and makes me go
all the time I play, is the Generic-Fantasy-Author syndrome of bombarding you with dozens upon dozens of stupid-sounding names that are apparently supposed to be relevant in some way, but only leave you scratching your head. It's just empty information, like empty calories. You are served texts that are filled to the brim with words, but their actual semantic value is so low, they could easily be trimmed by two or even three times their original length and nothing would be lost. PoE is simply in drastic need of a bunch of editors.