My Favorite patch while I felt my skills were reasonably good was 4.10

Tank masteries from preseason had been properly tuned down and it was before 4.11 when Ryze and Nidalee started taking over top lane because they were ranged and could often bully melee out of lane. The game felt like more then the standard best picks for any given class were completely viable and more likely to be effective.

It was not perfect but outside of a few things like Jax being over Tuned which resulted in being perma banned (for which he was a little over nerfed in 4.11) the game seemed like it was in the best balance state it ever has been.

Top lane mattered nearly as much as bot lane in carry potential making it something to not forget about for 30 minutes.

Mid was able to effect the game's outcome like they still do to a great degree.

Marksmen were still mandatory and effective.

Supports had been given several things to increase gold income to no longer be just a "ward bitch" but not so over the top that everyone was going support annie.

Jungle? they were still greatly impact games although IF I remember correctly were not in the hard carry state. Feral Flare was not in a over the top state making Master Yi able to consistently abuse it. Jungle was not the mega star carry but still could decide games based on their pressure so they still had a reason to exist and be played and did not feel empty to play.

The game just seemed to take a turn for the worst after this patch and it has never felt the same since. Kind wish a reset button could be used to brign the game back to this patch and improve on what what going on then.

Yes I am a "filthy" Irelia main and have been since Season 2. Through her lows of season 3 and the dominance of seasons 2 and 5 I still find 4.10 to be the best balance patch all around. This was not Irelia's glory days but she was not bad and not godly but able to be effective.