Well, in the third season there was more action so perhaps this is what you perceive as more exciting.
I didn't say I found it more "exciting", the stories flowed better. There was more meat (ideas/action) to the episodes than what we had in season one or two. There were less letters to Dr. Lucas, less hemming and hawing over pineapple, less utterly uninteresting bullshit that just screamed that Berman and Braga were completely burned-out.
Of course, everyone's mileage may vary. I find that seasons one and two of TNG were my favorites of that series. So what do I know?