Hi,
Slides are pretty important. Especially for a corporate website. They show what your website is all about. You don't want to have only text on your main page, and you don't want boring text on the upper part of your website—the first thing your users will see when they enter your site. They can see the main idea of the website with a slider. You can place beautiful photos, you can show your work, how your store looks like if you're a physical shop, you can show off your work, prototypes, portfolio, everything.
Just make sure you put no more than 4-5 sliders, and reduce their size. JPEG them, make them no more than 250 KB in size (every slide should be no more than 250-300 KB), and the 1920x1080 or 1920x1200 resolutions are the most optimal ones.