Much Ado about nothing weeks 2&3

After reading scene 5, section 1; I felt sick. The theme of characters being deceived is very old, and it unfortunately continues in this section.
As soon as Claudio and Don Pedro were told that Don John and the prisoners framed Hero, Claudio begged for Leonato's forgiveness. Leonato agreed to forgive Claudio for "killing" his daughter on the condition that he marries his niece, Beatrice. (Now, isn't that messed up? Why would Leonato want Claudio in his family after having Claudio kill his daughter?) Everyone finding out that Hero is "dead" and that Beatrice has to marry Claudio is another of the millions of examples of deception... Leonato is tricking Claudio into thinking Hero's dead in an attempt to punish him by making Claudio go on a guilt trip, but..............HERO ISN'T DEAD!!!! Won't this just create more conflict? I bet that Claudio will be mad at Leonato after he finds out that Hero isn't dead and Beatrice will be mad for having to marry Claudio....what the heck?!
I really hope that Shakespeare can come up with at least one more theme before this play is over; I honestly can't figure out what's so great about his boring plays?!