Maker's Mark is good stuff. In fact, almost all straight bourbons are good stuff. The legal requirements make for decent whiskey. MM was purchased by Beam Global (now owned by the Japanese company Suntory) a number of years ago. It's a bourbon that uses wheat as its small flavoring grain, compared to rye for most bourbons. The most expensive bourbons on the market, the Van Winkles, are wheaters. The distillery practices barrel rotation in its aging warehouses. Since maturation tends to be different at different elevations in a multistory rickhouse, they rotate the barrels to different floors throughout the maturation. I recently tried Maker's 46 and really liked it. They add additional charred barrel wood on the inside of the barrel which gives it an interesting profile.
It seems like there are often those who will make unfair judgments about a whiskey's quality due to its popularity. I believe that there are excellent whiskies coming from all areas of the industry. Yes, there are some that are not that great, but overall we are living in a whiskey heyday at the moment.
Other wheated bourbons, from my memory, are Larceny, W.L. Weller, and Rebel Yell. Rebel Yell is known as Keith Richards' favorite. It's cheap, but surprisingly good, especially in its current expressions. Never be embarrassed for enjoying popular whiskey. For example, I may not like Jack Daniel's black label so much since they cut it to 80 proof (in the 90's), but it is still a well made product.
As I stated before, If anyone would like a recommendation, PM me with some details on what you currently like, along with a price range, and I may be able to steer you to something you can add to your personal portfolio. Trying new things is what it's all about.