Yes electronic voting machines do work well to capture the voter's intent. The issue is not whether or not they work, but rather it opens up more room for people to tamper with the machines and cause the voting to not come out accurate. Electronic machines need extra security on them.
Any high school student can testify to the errors on a simple Scantron test. That is why students must double check them for erasing errors. Electronic voting machines leave such a large room for error that they can be miscounted, and when you take into account how many people are unsure of how to use them in the first place, plenty of voters' intentions are likely compromised.