I love comics, but I am certainly a novice. I've only started reading in the last 10 years, and I don't do it very frequently. I've mostly only read DC stuff, and pretty much only major events stuff (Death of Superman, Hush, Watchmen).
I just subscribed to Marvel Unlimited. I'm only going to be signed up for a few months, so I need suggestions on things that I must check out while I'm a member. I've read Planet Hulk, and I'm about 1/3 of the way through Civil War. Both of these have been okay, but not amazing. I was thinking about reading House of M or latest version of Deadpool with Brian Posehn. Any thoughts?
The Adam Warlock Saga:
Strange Tales v1 178 (Warlock) (1975)
Strange Tales v1 179 (Warlock) (1975)
Strange Tales v1 180 (Warlock) (1975)
Strange Tales v1 181 (Warlock) (1975)
Warlock v1 009 (1975)
Warlock v1 010 (1975)
Warlock v1 011 (1976)
Warlock v1 012 (1976)
Warlock v1 013 (1976)
Warlock v1 014 (1976)
Warlock v1 015 (1976)
Marvel Team-Up v1 055 (1976)
Avengers Annual v1 007 (1977)
Marvel Two In One Annual 02 (1977)
One of the best 'cosmic' stories in Marvel history. Written and drawn by the then-magnificent Jim Starlin. [If it's any added incentive, Joss Whedon has said it is one of the finest stories ever in comics. If you don't like Joss Whedon, don't read that previous sentence.

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Oh, and speaking of Joss Whedon, his run on Astonishing X-Men (v3 [01-24 and 'Giant Size' #1 with the story's conclusion], starting July 2004) is one of the best X-Men stories created, with the truly exceptional art of John Cassiday.
Off of Marvel, if you have access, by all means check out the truly astonishing 'Planetary' by Warren Ellis and that same amazing John Cassiday. It started in 1999. It has some interesting twists on well-known stories from multiple places (e.g. a visit to, basically, Godzilla's Monster Island; a Fantastic Four 'homage'). A complete hardcover of the entire story is
HERE. It is a huge (864 pages), heavy book.