I hate them as much I hate every greedy major company, be it Apple, Google, Microsoft, Dropbox or whatever. I'm really platform/client agnostic and just want to have job done and work with tools that meet my demands. I'm using Dropbox from the day one, and it's been working without major glitches all the time. Maybe it depends on particular configuration and/or bandwidth, but I've never seen it get in the way as major resource hog or having slow speeds.
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Like others have already posted, Dropbox have options which other clients simply lack. Versioning, selective sync, reliability, simple sharing even with people who don't have DB account, OS independent seamless syncing across the devices...
I've tried iCloud but their transfer speeds are beyond pathetic, clumsy web interface, poor syncing. Tried Google Drive and had to wait everytime for a few gigs file to be zipped for download, had to manually delete every file from account because they don't allow deleting all at once (! - support told me it's for my own security lol), tried now defunct Copy.com, advertised as safe and reliable because it's from Barracuda Networks, and it went down after several years... the only major thing that I didn't tried is OneDrive, but it doesn't look promising according to many folks over here.
Bottom line:
1. Dropbox have features other clients lack, and is reliable
2. I've never had problems with its transfer speeds or app behavior systemwise.
3. It falls within common price range, maybe buck or two more for the monthly plan I use.