It sucks to get filled support as someone who only ever really played Leona, then go in to this.
In the past I could actually play Leona to some level of competence. Now every ADC seems babied in to having a support do all of the poking and damage for them. When I used to main ADC I never expected any damage out of my support, nor did I expect my support to somehow miraculously prevent my opponent from auto-attacking me... I poked my lane opponent myself and I dodged the enemy adc+support's stuff.
Now I pick Leona and my ADC asks for a ranged support. I explain that I'm filled and only know Leona at all, then in game get berated that my pick sucks and I'm not doing any damage to them and he's getting pushed out of lane (yea, getting hit by every ezreal Q + every spell their mage throws will do that to you...). Then when they get out too far and I go for the all in the ADC half-heartedly goes at it but won't burn his summoners to finish the kill (they've used all 4 summs, I've flashed and exhausted after them and he turns away with flash and heal and instead of a 2-0 it's a 0-1). Then I'm the idiot who got greedy when "we" got their summs for free.
It's just as bad on both sides I guess I'm saying. I dislike that mages are playing support because they bring too much early damage down there and crowd out a whole class of support. I also hate how ADCs have been so babied by these mage supports that they've literally turned in to a "get me fed so I can right click late game" rather than actually playing the entire game. Not all ADCs of course - many actually know what they're doing. There's definitely enough that don't know how to play without a mage beside them though.
Whatever happened to supports being utility focused and there to ensure that the enemy jungler couldn't gank the ADC for free kills in the early game... Now t's like they deny the kill by just killing him first...