Angel Medina is my least favourite artist. Just cannot stand his overly cartoony and retarded drawings.
He ruined the climactic issue of the 'Blood and Thunder' storyline (Warlock & IW 25) where Odin looked like freaking Santa Claus and Thanos looked like a giant ape, in some shots. The art in all of the other related issues were amazing...but why they chose this guy to draw the most important and explosive issue of the story was just beyond me.
He also drew Hulk 444 and 445 which were part of the 'Onslaught' crossover, where his work was utterly atrocious. Hulk looked like a giant obese slob of green shit...not to mention Storm had fangs. FANGS!!!
Other artists I don't care for...Alex Maleev. His New Avengers issues look like rough sketches...not very pleasing to the eye.
Also, I was very unimpressed with the work of Renato Arlem in 'Annihilation: Silver Surfer'...mostly due to his work on Thanos and Galactus. For Thanos, I like the look that Jim Starlin and Ron Lim have created: Large black hollow eyes, (with an occasional twinkle or red dot when emphasizing a point or expressing rage), small raised nose, and Skrullish-looking chin. Arlem drew him as a normal-looking, darkskinned human being...rather than an alien. Plus he had all white eyes, which I also couldn't stand.
I guess I'm really picky when it comes to Thanos...as he's one of my favourite characters. Maybe I shouldn't be too hard on Arlem's overall artistic ability, as the rest of the characters and scenes were drawn just fine...and I really haven't seen any of this other work, but he sucked big-time when it came to drawing Thanos. That of course wasn't nearly as bad as John Romita Jr's outrageous depiction of Thanos in that Mangog story (Thor 21-25) where he looked so fricken obese that it was laughable, (he did the same thing to Zuras in 'Eternals' a couple of years ago). Of course that doesn't mean I hate the artist...cause obviously he's one of the best and most accomplished out there, but his drawing of Thanos was just terrible.
Thankfully, Andrea DeVito's interpretation of Thanos in 'Annihilation' was superb - I dare say even better than Starlin and Lim!