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With Season 1, Season 2 of the Flash was Season 1 upgraded. My personal favorite thing about the Season was the villain, Hunter Zolomon. Zoom was probably the best villain in the CW or the Flash series overall. I liked his plot with him using Time Remnants to go undercover to find out about Team Flash and I like how it (I presume) sets up for Crisis on Infinite Earths. I also was a fan of him not being erased or killed randomly but rather, killed by Time Wraiths and turned into the Black Flash which was a smart move in my opinion. I thought the Vibe plot was good as well as it shows that Eobard Thawne had an affect on the team even after being erased from existence.
I also thought the character of Henry Allen being freed from prison was extremely well and emotional as I enjoyed Season 1 with the plot of Barry Allen figuring out who killed his mother. If I had any dislikes for it tho, I do have to say that I disliked the character of Patty Spviot. I liked her in the beginning but right around when she broke up and had to leave Central City from Barry Allen is when I started to disliked her but other than that. I adore this season.