It's extremely disjointed, there are too many ways to do things and they aren't very intuitive, like previewing notifications, revealing the context menu from swiping down, the quick settings swipe with two fingers, accidentally swiping left back home/multitasker. Also:

Global Search. How do you do a global search on Android? On Android it's right on the home screen, with iOS it's there on the home screen but a little hidden.

Privacy/Permissions. How does one control the privacy settings on their device and know/control which app is accessing what? Android has permissions management per app, iOS has privacy management in its settings. They are both easy and clear to access and modify.

Backups. iCloud is essentially perfect, very futuristic, it backs up almost everything wirelessly; Android is great because all your data (contacts, calendar, photos, etc) is with Google and easily sync to your device, although I am unsure if it as robust as iCloud which essentially keeps a carbon copy of your phone.

Easy unlocking. The newest iPhones have TouchID, just tap and unlocked. Android has had patterns since forever and it has face unlock, also the newer Samsung phones have finger print unlock as well. It can be very frustrating typing a passcode each time you want to unlock your device.

Design and detail. Google and Apple are giving me the chills in this arena. iOS has always looked great and Material Design is hands down the best design language I've seen this year, sometimes I get a little envious of the design vs iOS. Google did an amazing job with that. Blackberry on the other hand has a design that is old that doesn't look like it's had the amount of thought that its competitors have. Apple, Google, and Microsoft not only understand how to make something that looks good, but also something that is intuitive, delightful to use, and focused.

Interoperability with existing services and devices. What if you have a PC or Mac or a tablet? How well will your Blackberry play with them? Apple devices work best with other Apple devices, but seeing that Google and Microsoft have extremely strong and versatile services, their products will work well on iOS. Android devices use Google services, which work well across platforms. MS devices use MS services which work well on Windows devices which are everywhere.

Strong commitment to platform services. Apple keeps building new services. Google is always building new services. Microsoft is now building new services. They all have a relentless command over their platform and show commitment to making their services better and useful. Siri, Google Now, Cortana, all compete with each other, all very strong services. Apple, Google, and Microsoft are simply the only companies with the resources to do things like these.

Always something around the corner. These companies work hard to make sure they keep us on our toes, this year I was impressed by Swift by and Android L by Google, I'm looking forward to Windows 9 from Microsoft.

Changes the industry and world. Apple, Google and Microsoft's changes are a shockwave throughout our lives. Collectively, they have an enormous power over billions of people and are changing lives every day. For instance, now that they've chose our Health and wearable devices as the new battlefield, we will probably see a massive changes of healthcare and fitness.

Wearables and Health. Stated previously but I can't emphasize this enough. We are all underestimating the power of wearables and the next few years will yield amazing technologies and transformations.

Home automation. For now the media has forgotten the release of HomeKit by Apple and how there are no products that support it right now, but boy am I excited to tell Siri to turn off my lights. I imagine Google will be doing interesting things with Nest and Microsoft has been toying with Home Automation for decades. This will be extremely interesting...

Free stuff, good customer service. I love all the free software from Apple (iWork, iLife) as well as the free repairs and replacements! I love Google Voice/Hangouts, Google Authenticator (app and server), Chrome and countless other really geeky Google services and advancements. Microsoft doesn't give me anything free that makes me joyful, but they are becoming a much more responsive company.

Tons of support. Because these companies have big platforms its not hard to discover if someone else has a problem (and solution) as well. Also they are quick to take care of issues.

Not going anywhere. I am sure that these companies will be around in the year 2100. I can keep some of my products as old relics. They will be in textbooks. I want to be on the right side of history.

These are many, but few out of the many reasons I think Blackberry devices seem painfully mediocre.

Edit: formatting and grammar