-Fair is already one of the ones with the most range in the game, just gotta learn to use it correctly
-Bair already auto-cancels, it can't have less ending lag as there is no such thing as negative landing lag
-Ftilt and Utilt have the power of some other characters' smash attacks. Speeding them up would be broken
-QD's only needed buff is no helplessness ever. Everything else about it is fine.
-Ike already has 1) one of the best throw games in the game and 2) already has a killing throw
-Dair could use some work
-Uair is fine considering it can kill air dodges. You do know it starts behind him, not in front of him right?
-Grabbing backwards I agree with, doesn't need more horizontal range
-Counter is exactly the same as Marth and Lucina's, so no
-Smash Attacks already are useful in their niche uses. Usmash is a great landing trap particularly with the increased landing lag from air dodging, Fsmash is for both reads and ledgeguarding, Dsmash is his fastest option and despite what some people think, is in fact fast enough for its job. Still the weakest of the three in overall usefulness, but its not a terrible option like it was in Brawl
Considering the amount of misinformation in your post, I don't think you've actually used Ike much if at all.
I play Smash 4 a lot and Ike is the character I use more (more than 100 hours with him at least), so I know a little bit, obvisouly I don't know absolutely anything about his moves but after playing with him for hours I can say for sure that he has way TOO MUCH slow moves. I don't say that all of these wishs should be fulfilled (I would be already happy with the half of these) but there so much that could help Ike rising to the upper tiers :
- My problem with the Fair is that the visual animations doesn't connect with the real hitbox properties, visually, the overhead part of the Fair touches the opponent but it doesn't really connect which is frustating
- I talk about Bair ending in the air, if you whiff the Bair, you are practically wide open and for a quick move I find it to be a huge drawback, the example with DK is great especially when the gorilla has a greater horizontal recovery.
- Ftilt and Utilt should still be slow but not that slow. Some characters can even punish Ike's Ftilt by a smash attack, that's unbelievable...
- QD, like Ftilt can leave Ike wide open for even more punishement, using it on ground is almost pointless since there is too much endlag to do something else after, I use it sometimes to catch off guard the opponent but if he is a little bit too far it's already too unsafe.
- Downthrow is a little bit weak too be a killling throw IMO but with the Uthrow it's good for combos but not as great as you say since there not so many options and Fair / Uair are still slighty slow. The horizontal throws have some use but I don't think it is that useful since it Ike running speed is not great.
- I know where Uair starts but it's the same with a lot of his move, the startup is a little bit much, i don't ask to be as fast as Sheik's Uair but I think even a slight increase of speed could really help and not make him broken
- For Counter I didn't know it was faster in S4, my bad
- However I heartly disagree with you for the smash attacks. Usmash is the only acceptable here and still, the endlag is too much for a not so powerful smash (still good thouhg). Dsmash is way too slow, some characters can even roll behind Ike and have the time to shield or even hit him before the second hit come. Fsmash is the worst IMO, yes it's great when you can read the opponent, but Usmash and eruption are already good for read / edgeguarding. It doesn't hit really that hard considering how slow it his both on startup and endlag, It doesn't hurt shield that hard like Dedede Fsmash, it doesn't have super armor like Ganondorf's Warlock punch and it's even weaker than Marth's tipper Fsmash. Like others Ike's moves, it doesn't deserve to be that slow when the knockback is not amazing.
Again, I don't think Ike should be buffed in every way but I think there is a huge problem with his moveset in terms of speed, especially against upper tier characters.