The average Swede doesn't love grammar any more than the average American, and most Swedes are as blissfully unaware of the formal grmmar of their language as most Americans, except when they encounter some telltale dialect irregularity. Swedish is to a degree a reformed language, unlike English, in which spellings have been regularized and grammatical anomalies pruned. Like English, however, Swedish has lost the vast majority of its conjugational and declensional forms, and like English, Swedish is loaded with words of Latin origin. In fact, Swedish is an awful lot like English, which explains the comparative ease with which most Swedes become fluent in English. Skipping over the curious Swedish articles and the "agreement of adjectives", Swedish word order is nearly parallel to English, and Swedes use a plethora of prepositions that seem outrageously idiomatic... until you realize that English has the same bad habit. It might help to imagine Swedish as the "other half" of English; if you put Swedish and French together in a blender, you'd end up with an English smoothie.
The Routledge Swedish Comprhensive Grammar is NOT a textbook for learning to speak Swedish. Believe me, learning to speak and understand spoken Swedish will require hours and months with a native speaker. Still, like other cognate-rich languages, Swedish should be easy enough to read with a modicum of grammar and a full-size dictionary. You DON'T need Swedish to visit Sweden, and you WON'T understand Bergman without subtitles just from a study of comparative grammar, but you'll be able to read Astrid Lindgren in Swedish in a few weeks if you try, and other great Swedish writers will eventually become available.
This summary of Swedish grammar is lucid, orderly, and remarkably complete. There are several kinds of readers who might find it useful: 1) teachers of English or linguists who do love grammar for its own sake; 2) scholars of Old English who want a comparative baseline for understanding the evolution of modern English; 3) people like me, who spent some of a childhood in Sweden but whose command of the language is imperfect.
Having tried at various times to teach Japanese and European colleagues a little more ample English, I can say that we anglophones have reason to be jealous. Would that we had as comprehensive a volume of English grammar as Routledge provides for Swedish!