Acceptance rate means nothing. It has nothing (or nearly nothing) to do with the quality of a school or its programs. There are a number of factors. You already mentioned the fact that, in general, the engineering departments of those schools have a lower acceptance rate than the whole school, but even then, it is going to be higher than some of the others you mentioned.
The more important trend is that the ones you listed with high acceptance rates are all public schools. As public schools, they are basically required to admit a certain number of students each year, particularly residents of the states they serve. Most public schools, regardless of their actual quality of education, therefore have both a higher acceptance rate and a higher attrition rate. They admit more students with generally lower high school grades, and are therefore likely to have more people eventually fail out if they are a rigorous program. Purdue has a pretty well known reputation for this, for example.
The important thing is, though, that neither of these two factors alone says a whole lot about the quality of a program. Ultimately, the real judge of quality (in my opinion) is what sort of companies recruit a school and how successful its graduates are in pursuing graduate schools. That’s how you know how valued the graduates are by industry and by academia.