About half of Lutherans worldwide have an episcopal structure. The real different is that Lutherans do not believe an episcopal structure is absolutely necessary in order for a church to be a truly apostolic church.
I think this is the key and crucial difference. Forensic justification by grace alone through faith alone, as applied in the proclaimed word of law and gospel and the administered sacraments of baptism and holy communion.
We actually have an "open" definition of sacraments based on three criteria: biblical institution, spoken word, and physical element, and all three together are meant to convey grace.
As a result, yes, most of the time we speak of only baptism the communion. However, the reformers absolutely did not want to make any sort of deal out of it, because the definition is not strictly biblical. Thus both Luther and Melanchthon (Luther's right-hand man) often dropped the third part of the definition and added confession/absolution to the list.
In general, we tend to speak of rites, sacramentals, and mysteries. Because our list is "open," you could very well speak of marriage (for instance) as a mystery and mean what the Orthodox church means by mystery, without using the western terminology of sacrament.It is an encounter with God that conveys grace to a young couple, but because that grace isn't exactly the forgiveness of sins but a different sort of divine activity, we don't really use the term sacrament.
Depends on what you mean. Some of us do genuflect, and my wife and I do pray with icons, but no, its not a big part of our tradition.