I was entertained. The murder mystery isn't going to impress anyone since you can count the number of suspects on one hand with a couple fingers left over. But the characters are interesting and are brought to life well by capable actors. Bridges' character is what would be termed today "casually racist." Fonda's character keeps bringing it up too despite getting further involved with the guy. It's kind of fascinating honestly. Both actors do well making you care about people that, on paper, seem pretty unlikable. Raul Julia steals every scene he's in.
I've come to appreciate Sidney Lumet's later work more as I get older. Not saying you have to be older to like his films but in my case it worked out that way. He wasn't afraid of complex characters, even offensive ones. It's hard not to respect that as we get closer to Demolition Man's vision of the future every year.