is this a good lens?

Canon Ef-s 18-135 3.5-5.6 Is

i am sortta looking to get a good used lens that in between of what i already have..is this a wide angle lens?

i have the Cannon 70-200 4L
cannon 50mm 1:1.8 II
cannon 18-55mm ( kit lens)
Quantary 70mm-300 w/macro

Depends on what you consider good. You have the 70-200L so you know what good looks like.
Reviews for the 18-135 dont put it on the good category in my book.
The 15-85 on the other hand, is a good lens. Sharp, USM, IS.

it'll have the same angle as your kit lens...and then go longer to 135mm...but the wide-angle will be the same at 18mm

as for if it's a good lens...you could probably do a little worse...but you could do better depending on what you are looking for the lens to accomplish

Depends on the price

You probably will not notice any improved image quality over your kit lens -- only a greater focal range.

It's a decent enough lens- if priced right. An improvement in IQ- not really- probably more of a lateral upgrade- if you find yourself swapping lenses a lot and don't want to- then the 18-135 has that in its favor. IMO, the 18-135 really represents a newer generation of walk about lenses for crops- a general purpose one lens solution in lieu of carrying two separate lenses to cover the same typical range. From what I've seen previously in the for sale forums- in the $200 ~$250 range for used. The new 18-135 IS STM has better IQ.. From what I've read- the 18-135 IS- the lens you are talking about- has better IQ than the 28-135 USM plus it goes wider- to 18.
Now, I recently gave one of these lenses away. The new owner just loves it. He, like me, was annoyed with lens swapping between the 18-55/55-250 - so even though he didn't get an IQ upgrade- he got more range to play with before he needs to swap- and well, he loves it. There are a lot of people out there that are satisfied with their 18-135's. Not particularly the absolute best lens- but then if the price is right, and they get the flexibility that they want- with decent IQ- that maybe in itself represent an upgrade..

The 15-85 represents a better lens overall- but new- it's also about $700. Used, I am not sure. The 18-135's price recently dropped some- to about $330 new- so one would hope that a $700 lens would have better IQ than a $330 lens would.