This is to open a healthy debate. Please remember, its not to hurt anyone who doesn't agree with me or who are apple fanboy/ fangirl. Your thoughts are highly appreciated 
1. Same design but fatter and heavier - 50 g heavier than iPad 2 and 30 g lighter than iPad. What a retrograde style, amazing !!!
2. 4G won't work outside US - so its an incomplete 4G device but you have to pay same price even you get 3G only speed in your country!
3. Battery is huge which takes more time to charge. The feature (4G) that is backed up by this huge battery does'nt work in Europe. So you carry extra weight (and spend more time and electricity) for nothing !
4. Its dual-core (tricky) processor, anyway. Cant be as fast as quad-core for example, Tegra 3.
5. Camera in most cases is useless but nice to have. You still fight in low light conditions. May be Apple is hoping someone will bring flash with 30-pin connector for iPad. They (want to make us) love to carry end numbers of accessories
6. Front camera is s(h)ame. Apple dont want someone see blackheads on your face!
6. Give me one example of tablet with mono (single) speakers. iPad really stands out here!
7. Old cases (that are body-fitting) becomes obselote.
8. Adding a portfolio case to new ipad becomes almost the same weight as ultrabook, for example, MBA 11.
9. Retina Display is gorgeous but not always practical requirement. The texts will become sharper but anyway you have to zoom to avoid eye strain for reading small texts (and large texts are pretty readable), same what you do with iPad 2. Now, app size is increasing and Apply s(t)ick to 64 GB at most.
10. If you are business people (do work with office files, send email with multiple attachments and transfer files between other devices very often), you still have to rely on other tablet/PC.
11. Still no higher (external) storage option
12. Most videos and picture need to be scaled up
13. Low brightness and contrast (than iPad 2)
14. Low-heat Cooking plate
15. Amount of pluses are much less than the what you compromise for retina display.
1. Same design but fatter and heavier - 50 g heavier than iPad 2 and 30 g lighter than iPad. What a retrograde style, amazing !!!
2. 4G won't work outside US - so its an incomplete 4G device but you have to pay same price even you get 3G only speed in your country!
3. Battery is huge which takes more time to charge. The feature (4G) that is backed up by this huge battery does'nt work in Europe. So you carry extra weight (and spend more time and electricity) for nothing !
4. Its dual-core (tricky) processor, anyway. Cant be as fast as quad-core for example, Tegra 3.
5. Camera in most cases is useless but nice to have. You still fight in low light conditions. May be Apple is hoping someone will bring flash with 30-pin connector for iPad. They (want to make us) love to carry end numbers of accessories
6. Front camera is s(h)ame. Apple dont want someone see blackheads on your face!
6. Give me one example of tablet with mono (single) speakers. iPad really stands out here!
7. Old cases (that are body-fitting) becomes obselote.
8. Adding a portfolio case to new ipad becomes almost the same weight as ultrabook, for example, MBA 11.
9. Retina Display is gorgeous but not always practical requirement. The texts will become sharper but anyway you have to zoom to avoid eye strain for reading small texts (and large texts are pretty readable), same what you do with iPad 2. Now, app size is increasing and Apply s(t)ick to 64 GB at most.
10. If you are business people (do work with office files, send email with multiple attachments and transfer files between other devices very often), you still have to rely on other tablet/PC.
11. Still no higher (external) storage option
12. Most videos and picture need to be scaled up
13. Low brightness and contrast (than iPad 2)
14. Low-heat Cooking plate
15. Amount of pluses are much less than the what you compromise for retina display.