Shows that I liked better during the second (or later) season are:

Charlie's Angels (I liked the show best with Cheryl Ladd, Jaclyn Smith, Kate Jackson, and David Doyle).

Charles in Charge

The Facts of Life

The Steve Harvey Show

Cagney and Lacey

1-800-Missing (I liked the show best with Vivica A. Fox and Mark Conselous).

I think a better question would be which ones are better during the FIRST season because I think most shows don't hit their stride until later

But some big examples in my opinion of shows that got better in the second or later season:

The Office (season 2)
Happy Days (season 3)
I Dream of Jeannie (season 2)

I've watched it since the beginning, but I think The Big Bang Theory got better during the second season.

The Odd Couple - Once they started doing the show in front of a live audience it got so much better.

Ellen - Although season 3 is the best in my opinion, season two is a lot better than the first "These Friends of Mine" season.

.
But some big examples in my opinion of shows that got better in the second or later season:

The Office (season 2)
Happy Days (season 3)
I Dream of Jeannie (season 2)

I forgot about I Dream of Jeannie and Happy Days. Those shows did, indeed, get better during the second (or later) season. I agree with you on that.

The Bob Newhart Show AND Newhart both improved by leaps and bounds in their second seasons.

I think that nearly all the sitcoms become better after the first season!
That's beacuse characters chemistry is improved, and you knew them a little more... that makes situations and jokes funnier!


ps. sorry guys for my English, hope you understand what I said! :)

All In The Family season 2 on.
Sanford And Son season 2 on.
Happy Days season 3 on.
Cheers season 2 on.

"Perry Mason"is a prime example of a show that got better as time went on. I did NOT care for the first season very much,but from second season on(1958-1959)to the end(1965-1966)was great.

I'm going to add Barney Miller to the mix definately better season 2 on.

The Jeffersons
All In The Family
Golden Girls
Cheers
Home Improvement(it was always a good show, I just like Season 2 better)
Reba
Maude
Three's Company
Friends
Roseanne

Cheers - after they moved to the emmy-winning Thursday night, it became so much better

Family Ties - even though S1 was good, most of the better episodes came in S2 and beyond

The Facts of Life

Barney Miller

The Jeffersons

Get Smart

The Facts of Life
Parks and Recreation

Mama's Family

Family Matters

Seinfeld

Punky Brewster (love season 2)

Perfect Strangers

Full House IMO improved in season 2 when Michelle began to speak and when Becky was added.

Dynasty was better with the addition of Joan Collins, the second season.
Melrose Place was better with the addition of Heather Locklear, the second season

Dynasty was better with the addition of Joan Collins, the second season.
Melrose Place was better with the addition of Heather Locklear, the second season

Excellent Point, markway.

Both Dynasty and Melrose Place were better during the second seasons, due to Joan and Heather. I also kinda give Heather Locklear a bit of credit for adding some extra spice to Dynasty's second season as well, although Joan Colllins deserves the most credit for being such a memorable and iconic character. But I really enjoyed Heather as the vixeny Sammy Jo.

Matlock improved in Season 2 with the addition of Nancy Stafford to the cast

Excellent Point, markway.

Both Dynasty and Melrose Place were better during the second seasons, due to Joan and Heather. I also kinda give Heather Locklear a bit of credit for adding some extra spice to Dynasty's second season as well, although Joan Colllins deserves the most credit for being such a memorable and iconic character. But I really enjoyed Heather as the vixeny Sammy Jo.
That's right, Heather came along on Dynasty the second season also.

A Different World was much better after Season 1 when Denise, Mille and Maggie Left the show, and Kim, Freddie, Mr Gaines, Mr Taylor joined the show and Debbie Allen Took over.

Cheers - I thought the first season was a bit slow compared to the rest of the series. It really came together in its second season.

Everybody Loves Raymond - I can't pinpoint when ELR became better but I thought it was a little weak during its first year.

Home Improvement - like Cheers, a bit slow during its first season. Really took off after that.

The King of Queens - similar scenario to ELR.

Seinfeld - I don't think Seinfeld really took off until its fourth season. It had a really sluggish start, imo.

Some shows that I think had a really strong first season are:

The Cosby Show
Frasier
The Golden Girls
Friends
Third Rock from the Sun

The Facts of Life
Parks and Recreationi agree with both of those

According To Jim

Characters were more developed.
Storyline and Writing was much better
The Chemistry was stronger.