While you can read 10 point type on the monitor you need to use at least 24-36 point for text and larger titles. That may mean more slides, but three readable slides are better than one that is unreadable. No Look at the data in column 14, row 27. Yeah, you bet. If that is the important data have it on a slide that can be read in the back of the room.
Script fonts look neat but are hard to read.
Use Arial, or Helvetica for clear appearing text. You want the audience to read the slide as you are talking, they shouldn t have to concentrate to read it. Do not put up a slide of text and then read it to the audience. If it is readable, they ll read it, if it is not, shame on you for presenting it. Use a solid background color.