Win10 is no less secure than 7 or 8. Tons of exploits come out, but it's the most popular OS in the world so that's natural. MS updates quickly, and in fact the forced mandatory updates in win10, much as I hate them personally, definitely improve security for most users.
I do wish EMET was part of the OS, not running in userspace, with compatibility settings and signatures updated via windows update. EMET is a substantial component of securing windows. If you're a techie running windows, you should be running EMET. Most exploits simply don't work with it running.
Additionally, I would like to see a browser (like Edge) integrating NoScript, Ghostery, or Privacy Badger natively. Again, signatures and settings updated in Windows Update, as these are too finicky and lead to too much page damage for the average Joe to handle on his own.
Last, I wish windows included sandboxing like Sandboxie and OSX's App Sandbox. This would be another substantial security improvement. Obviously universal apps are already sandboxed; I'm talking about desktop programs here.
None of the above are regressions from earlier versions of windows, just improvements I'd like to see added in the future.