[lmm]

Managing replication and consensus for me is valuable. Map/reduce infrastructure is valuable. Forcing me to fit my data into a square table model is not helpful. Transactions at the data layer are rarely helpful (transactional behaviour always needs cooperation from the application layer, and that's very difficult to achieve with a traditional RDBMs; almost all database-backed applications I've seen don't actually offer useful transactionality). My tool of choice is Cassandra or similar.