Starmaker: Jonathan Creek.

LongitudinalThrust: Leverage and the A-Team have the same premise, a group of outlaws that break the rules to help people who the law couldn't help. They both use the same character archetypes too. In fact the only character archetype from the A-Team that wasn't directly copied was Face, they split his character into two. The intro almost makes the comparison for me actually, so here it is:

https://youtu.be/daUtbMIsuUs

I'd say there's just as much humour in Leverage as the A-Team, it just has less silly humour.

It's been over a decade since I watched China Beach, but from what I remember China Beach is about the opposite of MASH. It's primarily darker stuff, with a bit of comedy moments.

amok: more serious then comedy. it is drama with some crime and mystery. it is just as much as about Allison and her family as it is with crime. but I liked it quite a lot, which I did not expect to do.

farmert: Have you seen Generation Kill ?

https://www.google.ca/search?q=generation+kill&client=firefox-b-ab&dcr=0&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi589KHtsLZAhUQcq0KHVxrAugQ_AUICygC&biw=1411&bih=697

RWarehall: While it has quite a bit of humor, it also covers a lot of issues involved with loss with dear friends. It exposes some of the mental anguish of losing close friends/co-workers, the dangers of firefighting, issues with alcoholism and other issues with people coping with stress. While a show like M*A*S*H covered similar issues with war sometimes, in Rescue Me it comes off as more "real life" and is more a central part of the show. That's what I mean by grittier. Might be more grit than you are looking for.

Monk is quite on the humorous side. I'd also recommend Person of Interest. It's not exactly humorous, but has it's fair share of light-hearted moments. It's not as deadly serious show as a Law & Order.

Stevedog13: It might not be quite the genre you're looking for, but I recently finished watching the entire series of Burn Notice with my family. It has action, humor and intrigue but in a way that's not too violent or with in your face gritty realism. The show revolves around a former CIA agent, Michael Weston, who is falsely accused of committing crimes. As a result he gets "Burned" or fired from the CIA. He desperately wants to find out who burned him and why so he can clear his name and get his old job back. Along the way he teams up with close friends and family to help people, similar to the A-Team. One of the things I liked is the the main character Michael likes to narrate, similar to MacGyver, where he tells you what he's doing and why.

Starmaker: Jonathan Creek.

gandalfnho: Looks interesting, and BBC-1 have some decent shows. Is lon the light side with some humorous banter at least?

gandalfnho: Is also light and humorous like A-Team?

OdanUrr: Well, I'd start off recommending JAG, the series from which NCIS was created and, incidentally, one of my favourite series. Ever watched "A Few Good Men"? That's JAG in a nutshell.

British crime dramas are, in my book, some of the finest TV you'll ever find and I'm glad you already got recommendations on Morse, Lewis, Endeavour, Life on Mars, New Tricks, Gently, etc. All of these are definitely worth watching. I'll also throw in Agatha Christie's Poirot (with David Suchet in the titular role) and Miss Marple series. I'd be remiss not to mention Sherlock Holmes. Here you have the 1984 series, starring Jeremy Brett, or the more modern adaptation with Benedict Cumberbatch and Martin Freeman. The US made its own version (as they usually do, often poorly) called Elementary, which I'd only recommend watching for Lucy Liu (Jonny Lee Miller isn't too bad as Sherlock). It is a tad too procedural for my tastes though, and each season has way too many episodes. If you don't want anything too dramatic, I'd counsel to stay away from Broadchurch and Luther (even though they're pretty good series in their own right).

Back to the US, I'd probably recommend The Mentalist and Psych. Curiously, they share a similar premise in that the main character is highly observant, what allows them to solve crimes in their role as a consultant to the police. In The Mentalist, the main character, Patrick Jane, used to be a con man who pretended to by a psychic. In Psych, the main character, Shaun Spencer, poses as a psychic in order not to get arrested by the police and it spirals from there. Psych is by far the more humorous of the two, dishing out pop culture references left and right.

Oh, yeah, and before I forget, you also have White Collar, a procedural about a highly talented con artist who's hired as a consultant by the FBI. Has a very Ocean's Eleven vibe.

Strijkbout: Sledge Hammer

Spectre: The Equalizer.
Set in New York it starred Edward Woodward as a retired espionage/intelligence officer with a mysterious past, who uses the skills from his former career to exact vigilante justice on behalf of innocent people who are trapped in dangerous circumstances. The series combined elements of the spy film, private investigator/police procedural drama, and vigilante genres.

Spectre: Garth Marenghis Darkplace is like that but with medics.