A rarely-seen review of DSL can be found on Flavio's TechnoTalk, and indeed he likes the king of lightweight-distributions.
The review covers mainly positive issues as
The beauty of DSL resides on its size, extensibility and flexibility. Traditionally, when you thought of a live CD linux distribution, you thought of a static distribution. DSL is flexible and can use any available read write media to save customizations and additions.
* Small footprint
* Very easy installation in a Hard Drive
* Dont even need to reboot your machine to run it
* Good wireless cards support
* Runs fine in old hardware
Not so good:
* Slow when running in embedded mode (as a virtual machine, on top of another Operating System). This is not really DSLs fault: emulation comes at a cost.