Zooropa, in my opinion, is an album that marks an interesting milestone in U2's career. It seems as though by 1993 they'd grown tired of their existing successful 'straight-rock' formula and wanted to experiment and diversify with some new and more modern and different ideas.
Zooropa is a mixture between conventional U2 instrumentals and dance/synth effects. With the exception of a few, more conventional, ballad style tracks that wouldn't have been out of place on Achtung Baby (Stay (Faraway, So Close!)), this album is essentially a chillout album complete with weird synthesized sounds and vocals.
This formula works but is so fundamentally different to U2 of old that it is hard to know quite how to react to it. My own impression is that though this album is very easy to listen to, it is better to listen to when you want music to chillout to. I can't see myself playing it as regularly as U2's earlier material and ATYCLB - dance music is not one of my favourite musical genres but it is that genre to which Zooropa essentially belongs.
Track highlights include Lemon, Dirty, and the two ballads of the album - the aforementioned Stay (Faraway, So Close!), and the haunting finale, The Wanderer.