I think rhymes can make something wonderful, and can give the listener a little buzz of excitement, or they can be dreadful, and make you feel like you're listening to the laziest cliche writing....
I'm gonna quote from Joni - obviously a favourite amongst millions, though not necessarily the place to look if you're looking for a gold standard of modern commercial material....
Born with the moon in Cancer
Choose her a name she will answer to
Call her green and the winters cannot fade her
Call her green for the children who've made her
Little green, be a gypsy dancer
He went to California
Hearing that everything's warmer there
So you write him a letter and say, "Her eyes are blue."
He sends you a poem and she's lost to you
Little green, he's a non-conformer
Just a little green
Like the color when the spring is born
There'll be crocuses to bring to school tomorrow
Just a little green
Like the nights when the Northern lights perform
There'll be icicles and birthday clothes
And sometimes there'll be sorrow
Child with a child pretending
Weary of lies you are sending home
So you sign all the papers in the family name
You're sad and you're sorry, but you're not ashamed
Little green, have a happy ending
....there is a structure and rhyming throughout, but it doesn't just spoon-feed you the obvious rhymes that you might be expecting...and some rhymes are half hidden just before the end of the line or between two lines that flow into each other without waiting to acknowledge that the rhyme is even there..... To me this is the most rewarding kind of lyric.
I think that not bothering with rhymes at all could be interpreted as lazy, but equally writing within a fixed metre and rhyme structure sometimes feels lazy too - if you are just looking for rhymes all the time (particularly if you're only looking for them in single-syllable words), this could allow you to be lazy and unimaginative with what you're trying say.
I like a good rhyme, and i guess most of what i write will tend towards fairly structured rhyming, but i try not to let rhymes dictate everything.... I really really really wish i could write as freely and cleverly as Joni!!!