I know the area well and have friends that live there. I had a garage apt there while my house was being rehabbed.
Crime is low. They have a civic club & web site
Lindale Park Civic Club, Houston Texas The side between Irvington and Fulton is considered the "brick side" where the homes are generally nicer and brick veneer. The east side is the "wood side" where the homes are more modest between Irvington and Robertson.
The metro rail line is supposed to go up Fulton to Northline. That should be a boost to the area when ever it happens. Northline being rebuilt will provide some much needed retail in the area.
About the worst thing is the lack of retail. Other than a multitude of Mexican restaurants (some quite good) along Irvington, dining and grocery options require a little bit of driving.
The area has appreciated fairly well too. Prices have roughly doubled over the last 10 years.
Lindale Park in Harris County 77009 - Neighborhood information
Overall it is a good, more affordable alternative to places like the Heights.