GSA worth even Tier1 backlinks if You use it properly. NOTHING spammy by GSA itself - just YOUR settings could make the work spam looking.
Ex. You could use for first tier SERengines (constantly updated) with unique articles You have in folder and using macro spinfolderdelete - so it will post Your unique articles permanently onto web2 sites, could post new articles every few days, these web2 will have natural looking profiles, unique About me sections, all will be edited from diferent IPs and so on, and so on..
If You spent a bit of time to learn how to use GSA (and if You have some SEO knowledge as a backgroung), You`ll found out that it`s a NUMBER ONE SEO soft and may be the ONLY ONE which may give You best rankings today.