How unfortunate for you. Kill it with fire.... not Windows Media Player. It's certainly still alive and well here.
I certainly won't be installing Win10 over my last remaining Win7 install until Win10 gets to at least SP2.All in all, as it's a free upgrade from Windows 7 or 8, I'm definitely going to upgrade come July the 29th.
Win7 is perfectly stable and still has five years of support still to come, it's not worth taking a punt on the "upgrade" being a downgrade - as early adopters of Vista and Win8 found out to their detriment.