How good is the University of California, Santa Barbara's Computer Science department for undergraduates?

Most of the undergrad CS programs have many similarities like fundamental programming, algorithms and data structures, architecture/hardware sampling, etc. UC is a solid second tier school so it won’t be so easy to get into it. It's like you are appearing at a coding school; anywhere at this stage, they're all very similar to be honest. As per the Network Environment reports, UCSB has the lead among the top 25 universities in the field of computer science. 

What is worth noting is UCSB’s power that is obtained from its dynamic environments and offices. As the 3rd host on ARPAnet, they compensate for their loss. As long as you're not in the purely theoretical CS, you should be fine. The university's chancellor is also pretty good. Many other departments reach out to the CS department to resolve their issues. Overall, their administration and faculty are good and politically aware. You will have many internships and opportunities to work along with your studies so you shouldn't just focus completely on your curriculum. 

Regarding employment, most graduates are well placed with their median pay scales ranging from USD 71,700 to USD 147,000. It is clear by looking at the median salary package that UCSB is quite good. Also, this CS Department has recently seen an increase in the National Research Council's most recent Ph.D. program ranking (NRC), placing their Department of Computer Science in the top ten! Concluding, It is pretty impressive