Well, pay to win is only derogatory to the people paying to win.
For the rest of us, we enjoy pwning the noob who thinks he can bypass the in-game mechanisms- right at launch mind you!- to zoom past everyone else. It may be legalized cheating, but no doubt the sole purpose is to gain an advantage over someone else by putting money down. That is pay to win. There is no other reason to spend the money, right? You are paying for an advantage to win games because it's the easy way out rather than actually getting skill or putting the time in. It may be infuriating to hear this, but I'm not your buddy, I'm just commenting on an industry trend.
If you paid to win, own it! It's not a commentary on who you are, it's just saying that's what happened. Maybe you don't have time to play the game, and the only way you can join the main part of the game is to spend some money. Okay. By the way, that's what the developers are hoping for. :-) They want to coerce you into zooming past other people by paying money.
As far as league, you can only choose one champion and one page. If you are going into a draft mode, you are taking it upon yourself to play hardcore. If you are playing normal random, you can't see the other team choices anyways, so it's not like variety is going to help you. You only get one choice, and it's blind. So that's a moot point. I'm certainly not going to defend league as some bastion of sanity in a microtransaction world, but they have bent over backwards to level the playing field, and you can't zoom past other people with weapons or monster cards. Progression pages are locked by level. That's a big difference. I've never been on the field and felt outgunned, and I have never paid a cent. Most of the folks that I roll with only put in money for skins- for the lulz basically.
If I felt that I had to pay money to play a "f2p game," I wouldn't play it. I don't have time to get caught in some rat race of who owns what, keeping up with cards, and whatever else. I don't like Facebook games for a lot of reasons, and a lot of people make fun of them for this very reason. I'm not the first person to make fun of pay to win experiences. f2p is p2w, most of the time as far as I can tell. I'm sure there are exceptions.
By all means, carry on with these games, and don't take it as a personal thing if someone else says it's silly to get caught up in paying money for something that's advertised as free. That's just my opinion, and my opinion doesn't have to be yours or affect you in the slightest. Carry on!