I played a F2/W14 in a HoDQ/STK campaign for around 2 real time years. Iirc, 114 Hp, high AC due to armor, and the action surge was great for that extra casting. I also made the mistake of doing Necromancer, but ended up just a straight Wizard for all intents and purposes. Was, for all intents, the most powerful member of the party. Only the Totem Barbarian was close, and it came down to Init and Saves head to head.
I found it, frankly, to also be a bit overwhelming, all of the spells, bonus actions, reactions, species abilities, cantrips, feats, etc. It didn’t have the ‘wizard‘ feel I was hoping for, and was basically a set piece by set piece blaster or controller. All I needed to do was shut down the monster or whatever for one round, and the rest of the party smooshed it. The campaign was ultimately rather anticlimactic.
I also don’t think the F2 part was that powerful, aside from the extra couple of HP at first level, and a high Con made it easier for concentration checks. I did it more for theme and background (soldier) than in-game power,