Chicago Fire is still my favorite of the Chicago shows
The drama gets tedious sometimes, but I really love the characters on the show. It's a very likable cast.
Also, the action scenes, constrained by a TV budget, tend to be scaled down to reality. If Chicago Fire was a movie, the whole city would be on fire with huge plumes of smoke everywhere. Not so here, where a fireman can save someone or get killed without facing the after effects of an almost nuclear explosion. To me, that seams true to life.