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Network Lock-in AT&T or nothing? In a lot of places, it's hard to tell the difference.
Walled Garden Only Jobs-approved apps, and only via the App Store. How un-Internetty.
Bum Battery Many 3GS owners have to charge their devices every day, spurring the Los Angeles Times to dub the 3GS' disappointing battery the "iDrain." Ouch.
Weak Camera One would expect the iPhone to have the most advanced cell-phone camera around. One would be very wrong. Better now than before, but still not great.
Dock Incompatibility 3G models don't fit in the older iPhone's dock. This is like coming home with a new baseball glove and discovering it only has room for four fingers.
Overheating Handsets Some iPhone 3GS users have reported white casings on their phones developing brown burn marks. Apple's response? It cautioned users against operating the 3GS on hot days.
Buggy Visual Voice Mail Users report not being alerted to messages for days, inability to access voice mails by clicking from voice mail lists.
Uneven Apps Many useful, many less so. Example: a gardening app fails to tap the GPS to provide regionally-appropriate planting tips.
So-so Phone Maybe one of those app developers should write something to improve call quality.
Smug Users You bought a cool phone, people, you didn't build it. Get over yourselves.