Episode 18 ... if this episode doesn't convince you that this is a good anime, then you're beyond hope.
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... And Nena can just die. Seriously. Where's a Death Note when you need one?
The Throne Gundams go around destroying military bases systematically. At one point, Nena spots the wedding Louise is attending and basically says to herself, "I'm working my butt off, they shouldn't be happy when I'm working." So, she basically fires a couple rounds into the wedding. Just about everyone dies. The Throne Gundams also attack bases even if there are only civilians working at them. Graham fights a Throne at a nearby base, and manages to cut off Eins' right arm, but it seems Graham can't handle the G-forces as he coughs up some blood and is unable to pursue (he lives though). Meanwhile, Setsuna and Co. try to decide on their next move, and we see Tieria look into Veda (renamed from Vader). Saji goes to visit Louise in the hospital ... I won't ruin what happens there ... At the end, Setsuna decides that the Trinity Meisters are causing warfare and attempts an 'intervention' by himself.
If this can't be called a good episode, then I don't know what can.
Oh, yeah. There's a promo for Code Geass R2 afterwards, at least in the Shinsen-Subs version.