depends on your level of training. for a newcomer, yes, a few sets of just bench press is enough for one session. however you should be able to do 3 sessions a week. lower volume, but more frequency.
the common trend is, the longer you've been training, the more volume you do, but the frequency decreases.
an IFBB pro bodybuilder might do 15-20 sets for the chest, 3-4 different exercises, then doesn't work chest again for 5 days. but it took him 8-10 years to get to that stage.
training is a progressive thing. you don't walk outside and run a 20mile marathon the first day you start jogging...teh same holds true for weight lifting.