My impression is that Zendikar has many mechanics that are incorrectly estimated: spell-lands and kicker. I think the land-spells will become widely played in multiple format for being lands. Sure, there are real duds, but there are real good ones. land / card draw, land / counter, ... kicker is easy to undervalue because they help the mana curve and add flexibility.
Party, I agree, will probably turn out not to be good in constructed... but very good in limited. The cards turn from mediocre to okay to good at 2 party members. They turn to great to amazing at 3 and 4 members. With full party, many of the card are at the busted level:
- a single mana to tutor any card and then cast a 4 CMC spell for free? For goodness sake! That's just bonker crazy over-powered.
- a single mana to destroy any creature or PW? Even alpha had nothing that good.
This does not make them good in constructed. But in limited they will shine.