The RE92's on the 05 GT are good for what Subaru wants them for - to provide a balance of handling, wet, dry, winter, summer, etc. Spent yesterday (all day) driving in and around the West Virginia mountains (including unmade roads) - it was, wet, rainy, misty, you name it. No tire issues at all - was I going 10/10ths? Nowhere near it, but to do so on the public roads is pretty stupid. For going noticeably faster in the twisties than most everything else under those conditions though, the tires were fine.
To the point about comparing Legacy fit with WRX - the car set ups and NVH management are so different that you are comparing the cars, not the tires. Only way to compare tires accurately is back to back on the same car - preferably tested "blind", so the driver does not know which set he is on. That way you get unbiased results absent the "buyer emotion" that comes into play when you have laid out money for something and have to belief it's OK.