This article itself demonstrates some of why the Orthodox oppose reunification:
1. We don't have the same Nicene Creed - the Orthodox regard the "filioque" as heretical...this is well known and obvious.  You can't just ignore it.

2. The Orthodox do not recognize the sacraments of the Catholic Church as valid...they view purported sacraments of heretics as "graceless."  While the Catholics do recognize the sacraments of the orthodox, it doesn't work in reverse.  Ascribing Catholic Sacramental theology to the Orthodox usually grates on them.

3. Papal Infallibility is Catholic dogma...don't down play it.

 The article simply ignores the reality of both Catholic and Orthodox theology.  The Orthodox oppose reunion with what it deems heretics.  This is not a shock.  Give up the filioque, Papal infallibility, Purgatory, the Immaculate Conception and a few other doctrinal impediments and become Orthodox and the Orthodox will gladly reunify.