Most of the machinima I watch is mainly Warcraft related. Its very rare that I like the films made in Second Life. Many of them are unsophisticated. Most of this is due to the clunkly interface that SL offers in it's rickety browser. Machinima creators really have to fight and jump through hoops to get a film that looks good.
This was one of the few that managed to do it. A very lovely short about a lovely SL sim, Embryo.