I thought the split season worked out perfectly fine for Series 6, with the overall arc of the Silence and the Doctor's death.
I think the problem with Series 7 had more to do with keeping the Ponds around too long and the somewhat lackluster stories that were written. And the fact none of it really seemed to flow that well.
opposite way round for me - the season 6 split totally fucked the season, so although I enjoyed the episodes individually I hated the season. The season 7 split worked well, basically making two shorter seasons that both worked, without fucking up the ongoing arc/development in the middle.
The Ponds staying too long is a totally different matter - they should have been gone as of the end of season 6, and bringing them back really just fucked up the effect of the developments they'd undergone.