Shocking title, I know... the thing is, to wrap up the entire series is a good ending. One of the main complaints I read here and in other forums is that the special is full of reused footage and so, that's a big lie.
Over the 1 hour and 19 minutes of the special, it has:
- 15 minutes of re-used footage (8 at the beginning and 7 at the start of the last third of the special)
- 4 minutes of bloopers at the end
- and 1 hour straight of new footage

So, don't believe that this is a summary of the whole S1 and S2.

Now, about the story, actually is meant to be a wrapping-up episode and it accomplishes its goal. I like that the actual wedding was short (around 9 minutes at the ceremony) because, actually, seeing a whole weeding preparation and so would take hours and it would be deadly boooring.
Don't mind too much about the plot, it has no drama, is just the closure for the series and they develop a good job, the house is mesmerizing (I fell in love with the house hahaha) and the happy ending was cute.

Don't look at this as a cinematographic wonder, is just a special episode for fans, nothing more. Enjoyable, yes... outstanding, well, no, but it doesn't have to, the whole series worth it.