Angry
While most people see mobile as the answer to so many problems, research from Nielsen Norman Group sees it as another problem on the list.

“The key finding showed that users are 35 percent less successful completing Web site tasks via their mobile phones than they are on a regular PC. The usability studies leading up to this newfound research was conducted in the U.S. and Britain, where Nielsen Norman Group researchers found that the average success rate for users to complete tasks via mobile was only 59 percent.”

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(See also this other story on the same study)