[bdarfler]

It seems a bit disingenuous to post slides now reviewing a year old version of MongoDB that is almost 3 major revs behind.

These days auto-sharding works and works well. There is a learning curve to optimize it (i.e. picking a good shard key, analogous to picking a good _id field) but that is to be expected.

Replica sets work exactly as advertised in my experience. Automatic fail over and no need to wake up at 3am is a huge win.

Finally single server durability directly addresses durability concerns that many have.

The first two points are the reason why my company and so many others are switching even if that means needing to understand how to pick good ids/shard keys and having to shorten our field names by hand. I can see why, if they were not available at the time, MongoDB might not be a good choice but the fact of the matter is that they are available today.