This is one hell of a unique show and the first season is done incredibly well. Having a main protagonist who is a chaotic neutral (not bad, not good, and unpredictable) is fun. The first season was simple yet complex enough to really pull me in. It has great character development and many "OH DAMN!" moments that make it stand out. I'd easily give the first season a 9/10.
The second season was decent, but not nearly as polished. Way too many new characters, and the bets were either convoluted or meaningless. Possibly worth a watch, but the ending was completely lacking.
Season 1 - 9/10 Season 2 - 5/10
Series as a whole - 7/10
Watch the first season and if you really love it, go into the second season with lowered expectations.
The second season was decent, but not nearly as polished. Way too many new characters, and the bets were either convoluted or meaningless. Possibly worth a watch, but the ending was completely lacking.
Season 1 - 9/10 Season 2 - 5/10
Series as a whole - 7/10
Watch the first season and if you really love it, go into the second season with lowered expectations.