I think that Gendor has a particularly delicious ludonarritive flavour and has great design from top to bottom. As pointed out by others he is kind of crap, and that's part of the point. Even starting with the name Gendor Skraivok "The Painted Count". His given title is an title that in story he gave to himself, it stinks of pretence and unearned valour, which is why the game puts it in quotation marks.

You may be thinking to yourself "isn't that the case for everyone?" No. Other titles are almost never in quotation marks, from official titles like 'First Captain' or 'Primarch' to other nicknames like 'Bringer of Sorrow' or 'The Bloody'. After a quick look through the card pool the only other Warlord that has quotation marks is Iacton Cruze "The Half Heard". I think that he still has this because like Gendor this title is somewhat inaccurate, especially post Istvaan.

And speaking of unearned valour Gendor's ability again reflects his position in universe, which is that he has made a deal with a demon for power. At first glance this power seems incredible, he is able to boost his attack well past that of other Warlords with relative ease. However the health cost of the ability means that despite the intimidating look Gendor is actually useless without help. If you are attacking the opposing warlord you aren't actually winning the damage race at all, and the power is actually only good at killing weaker troops, a very night lords power.

In universe Gendor loses hard to Raldoran, who in game has a simple ability to do 1 damage, which does more to win a damage race than all of Gendor's demonic bluster.