Well, who's to say the ending will be bad, if it doesn't stop here.
Since they're continuing, all you really can do, is hope for the best, from here on out.
Unless you want to block out the continuation of the series, and act like the end of Book 2 WAS the end of the series.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)