are the excluded pages important? I mean, are they "money pages" (pages you want to rank in google because you expect them to make you sales), or informational pages (pages that you don't expect to bring you sales but are still important to rank because they presell or educate your visitors)?
If yes, then you want those pages NOT excluded by google, and one of the most common ways to not exclude them is to make sure that the noindex tag is not applied to them. Google excludes pages usually because they are noindex'd
Regardless of whether or not you want those pages excluded from google they won't affect the rankings of the non-excluded pages, but they will affect the rankings of themselves because... well... they are excluded from google, so they won't rank