How do you feel about the Sonic Rush games on the DS compared to the main series?

[killamch89]

The Sonic Rush games on the Nintendo DS had their own unique flavor with the emphasis on speed, platforming, and the addition of new mechanics like the Boost Gauge. How do you think they compare to the main Sonic series titles, like the ones on consoles? Did the DS games bring anything fresh to the franchise or do you feel they fell short in any areas?