Idk, it was horrendously insecure, would freeze a lot, and missing creature comforts like window tiling.
It was significantly more secure than it's DOS-based predecessor of the time, Windows ME (that's a whole other rabbit hole; if you wanna talk insecure and buggy as fuck - look no further). That's what people don't realize, they look at the past through a modern lens. You gotta look at it from the time it was released. There's a reason mainstream consumer-focused Windows editions dropped DOS and moved to the NT kernel. XP was the first real consumer version of Windows based on XP NT.
If they kept refining Win7 it would've been great.
They did, it was called "Windows 8" and nobody liked it.