I find Planet Fitness very enjoyable. It is a more laid-back gym environment, in my opinion, with plenty of variety to change up your workouts. I joined (Willowick's location) in January of 2015, but I didn't join necessarily with the intention of losing too much weight; I just wanted a place to exercise on days I felt like it. It's been a year and a half and I still workout very regularly because I genuinely enjoy working out at Planet Fitness.
Willowick's location is very spacious and clean. Equipment is laid out nicely--plenty of personal space even when the gym is busy. The staff seems accommodating, as well. Occasionally there will be issues with the water fountain and the employees offer free water bottles to make up for it; that's just one example.
For someone looking to start a healthier lifestyle, I strongly suggest PF! They're open 24 hours and it's very affordable for everything they offer. It's an environment where you feel comfortable going at your own pace, and that's important when you're looking to enjoy working out!