If you finish high in your class, you should be able to secure a summer associate position in a large law firm. I am a 2L at a large, urban school ranked in the mid-60s. I finished within the top seven percent of my class and made law review. Most of the other members of law review were able to secure summer associate positions in large firms; many here, some in their home cities. OCI was a very competitive process, however. Those who were not in the top seven percent of the class, with maybe the exception of five or so students, did not gain summer associate positions in large law firms. Some on law review failed to do so as well.
The difference between top schools and the rest is this: at HYS and at a handful of other schools, you can finish anywhere in your class and attain a summer associate position at a large law firm. To attain a similar position at my school and others similarly ranked, the process is very competitive. At schools lower ranked than mine, maybe only five or ten students from the entire class will get something similar. Obviously, there are certain jobs -- Supreme Court and circuit court clerkships; jobs at certain elite large law firms in NY and LA -- that exist only for a handful of students at a handful of the top schools.
You can get a position at a large law firm; anyone on here who states otherwise is wrong. Don't take my word for it. Look at websites of large law firms and browse the bios of the associates. But, it is competitive. You have to finish near the top of your class.