@RaginSam Honestly I don't think its "That difficult". Of course, if you're a normal person who works alot and has other life stuff, you won't get too far
But I'm currently S200 and I haven't been playing this game all that much compared to previous games. Since launch to S1 I've only played 50 or so hours, then quit for around 6 months, came back at the end of S2 and managed to get myself to S200 playing a few days a week. Sometimes I give myself an entire day if it's double XP or a new season.
If someone has more free time, its fairly easy to grind super high ranks.