The capable default browser
A lot of people complain a lot that the default browser is unusable.
I've never had much issue with it and I claim that it's mostly down to crappy, non-standard compliant Web site design that is sucking up your info and serving up ads and generally just screwing around.
HTML5 test would seem to back that up...and no, the standard has not changed yet.
On this auspicious day, I hit up apolloinrealtime.org with my Z10. You can't get any slower here...yet this complicated site actually worked! A bit slow at times, yes but no problems with the images, clicking around, the audio stream with the real time counter and all. Given everything that is happening on this site, I find it hard to believe it is missing much functionality that any web site could possibly need.
This seems to be the same sort of crap that happened with HTML email back on BBOS7, there's a lot of HTML email that doesn't work, yet when I craft an email from Outlook with virtually every feature I can throw at it, my Bold rendered it perfectly.
Heck, this is why Microsoft threw in the towel with Edge as they just couldn't keep up with patching all the bad behaviour from the major Web sites. Don't blame BlackBerry, not too much wrong with the browser. Blame the web site developers...