When the book and television series first started I liked Tyrion. What was there not to like? A base dwarf with a heart of gold and the wits to match anyone. The farther the show goes the more incompetent he becomes. As a hand of the queen he has proven to be a dismal failure. Its time to retire Tyrion so we can remember the good times instead of the bumbling dwarf he is on the way to becoming.
Just a short summary of his time as hand.
Landing at Dragonstone
This has to be the biggest blunder Tyrion has made. The original Aegon landed at Dragonstone because he had very few troops with him. His military assets consisted of pretty much his 3 dragons. When he fought the Lannisters and Gardeners at the Field of Fire he was still massively outnumbered even with the defecting Riverlanders flocking to his banner. Dragonstone made sense because he needed a defensible starting point.
Dany is starting with 100,000 dothraki bloodriders and 8000 unsullied. A force that is unmatched anywhere in Westeros. At the height of his power Tywin Lannister had 60000 troops. 30000 under him and 30000 under Jaime. Tyrion managed to land the dothraki in the one place in Westeros that they could not deploy out of and require additional waterborn transport to be effective.
On a related note the only reason Euron is even relevant is because Tyrion chose an island as the home base for the Dany faction. If they landed anywhere in the Stormlands or even in Dorne Euron would have to challenge them on land to be useful to Cersei, throwing away his biggest advantage.
Losing the Iron Splinter Fleet
To compound his decision to stick his army in an island Tyrion decided to send the Arya Iron Fleet off to Dorne. At this point it gets intercepted by Euron who is in the same area and they lose the entire fleet as well as the leaders of Dorne. With Varys in tow there was no way that they were unaware of a gigantic ironborn fleet was hanging out in Kings Landing. Not to mention Arya already warned them that Euron was against them.
As a result of his blunder the dothraki have lost their transports towards Westeros proper and the army from Dorne is now questionable. After all the leaders they were supposed to rally around are lost. With Tarly taking up against Tyrell and the sand snakes defeated it is not even likely that the Targaryen forces can lay siege to Kings Landing.
There is quite a bromance going on between Jon and Tyrion. It even seems like Tyrion is angling for Jon to be the future husband of Dany. The problem is that as of right now the only redeeming factor for Jon is that Tyrion likes him. As an ally he is worthless and is actually a drain on whoever he teams up with. As of right now the Vale should be ready and willing to take the fight to Cersei. Instead since they allied with Jon they will now be wasted against the undead. Any forces Dany sends with Jon will meet with the same fate.
Impeach Tyrion now!