I don't have wifi...wasn't aware I couldn't download some apps without it...if it over a certain size you can't use the 3G service....my YouTube app sucks.....I don't know...I feel like this thing should be AMAZING for the cost....
No matter what you pay for an Internet device, your data connection is key. If you buy the fastest computer for thousands, but your Internet connection is slow, you're still up a creek.
The restriction on downloading via 3G is set in conjunction with carriers, because they're trying to avoid overloading carriers' limited resources. I've read that you can jailbreak your way out of that limit from your iPad, but you'd probably still run up against your carrier's limits, depending on how much data you use and whether you exceed its cap and they throttle down your speed.
If you're not happy with iPad's limits, you might buy another tablet instead, but you'll probably still have the limits on data if you lack wifi.