Yep. Even though it's true that people will mostly end up just skimming the resume, errors or just general slapdash are huge red flags. I'm not even a particular believer in customizing resumes (unless you're looking at genuinely different types of jobs) so it's really worth the time to get it just right.

When I said "good resume", I did not mean "An aesthetically pleasing resume" or anything of that sort. I mean "A history containing the traits the would-be employer seeks".

I mean having a clear summary at the top regarding your desired position/goals, with a keyword mash of the technology you've used followed by details of work history, projects and the technologies used is a better place to start.

Having actual paragraphs combined with the keyword jumble goes a long way. You don't have to do excessive customization for each job.

I'm not sure about the technology keywords. As a student you most propably won't have extensive knowledge of any technology. I simply don't believe that most HR persons know that somebody who has experience in Java from university courses is equally suited for a C# job.