Earlier quoted context omitted.
No, the votes of people in certain states being more valuable than those in others is also true of the House and Senate. In fact, the inequity in voting power produced by the Electoral College is a direct consequence of that in the structure of the House and Senate, since the latter is apportioned simply (except for DC) by adding the apportionment of House and Senate seats.
I responded to a similar point by not2b downthread. The following are some additional points I didn't make there. To some extent the inequity you describe can be corrected by forcing particular methods for apportionment that can better prevent gerrymandering, and by increasing the size of the House to reduce the difference between the populations of the least and most populous districts. A certain amount of inequity…
Wrong.
Individual members of Congress tend to have high (often overwhelming) approval in their districts (or states for Senators); members generally do a good job of representing the people they are elected by.
Congress as an institution has low approval rates because people dislike what it does in aggregate, not what the people they have a vote in do. If Congress was more effectively representative—which is a matter of apportionment and electoral system—the aggregate approval would be higher.
This is not only analytically obvious, but borne out by actual results of surveys of public approval of representative democratic governments in general and legislative bodies specifically when compared to measures of effective proportionality of representation.