Frank Tanana would be on the first ballot if there were a Hall of Fame for underrated Pitchers.

Tanana played the first eight years of his 21 with the California Angels, and if you were paying attention, you were seeing one of the best hurlers in the American League.  The southpaw was easy to overlook, as the Angels were only in the playoffs once when Tanana was there (1979), and he was on the same staff as Nolan Ryan, so ace status was not bestowed upon him.  

Debuting in 1973, Tanana was in the rotation the following year, going 14-19, but despite the losing record, he had 180 Strikeouts with a decent 3.12 ERA.  Tanana then had three great years, where he was in the top-nine in Cy Young voting, and kept his ERA well under three, including winning the ERA title in 1977 (2.54) and also leading the AL in bWAR for Pitchers (8.3).  In the two years before, Tanana also had a bWAR over seven, was first in SO/BB, and had a Strikeouts Title (280 in 1975).  With what we know of today’s advanced metrics, it is possible that Tanana should have captured the Cy Young, but he was ninth, distantly behind Sparky Lyle of New York.

Tanana's last few years were plagued with tendinitis, and his pitching suffered, but he was still a competent starter and helped California reach their first playoffs in 1978.  He was dealt to the Red Sox before the 1981 season, leaving the Angels with a 102-78 record with 1,233 Strikeouts.

Chuck Finley played most of his career with the Angels, beginning from being a First Round January Secondary Draft choice in 1985.  

The southpaw first made the Angels roster in 1986, and he came out of the bullpen for his first two years before becoming a part of California's roster in 1988.  Finley did not do well in his first year, but he was an All-Star the next two years with ERAs under 2.60 and at least 150 Strikeouts.

Finley would struggle in 1992, but he returned to ace status with the Angels, going to two more All-Star Games (1995 & 1996) and winning at least 10 Games from 1993 to 1999.  

Finley left the Angels when he signed with Cleveland as a Free Agent after the 1999 Season, and with the Halos, he had a 165-140 record with 2,151 Strikeouts.  He is, as of this writing, the all-time franchise leader in Wins and Innings Pitched (2,675) and is second in Strikeouts.

In 2009, Finley was inducted into the Angels' Hall of Fame.

Nolan Ryan was one of three players who the New York Mets traded to get Jim Fregosi.  With all due respect to Fregosi, his best years were behind him, and Ryan, however, was about to break out.

The Ryan Express came to California in 1972, where he went to his first All-Star Game and had first in leading the league in Strikeouts (32) and H/9 (5.3).  Eager to prove that it was no fluke, Ryan fanned 383 batters in 1973, one more than Sandy Koufax did in 1965, and breaking the modern mark.  Finishing second for the Cy Young that year, Ryan was third in Cy Young voting with 367 Ks, and his second straight 20 Win season.

After slipping in 1975, Ryan was back to being the most dominant flamethrower in baseball, leading the American League in Strikeouts annually from 1976 and 1979.  He was a five-time All-Star with the Angels, with a 138-121 record and 2,416 Strikeouts.

Ryan signed with the Houston Astros in 1979, and the native Texan stayed there until 1989, when he played for Texas for five years.  Ryan will always be most associated with those two teams, but it was what he did in California that he first showed that he was an elite Pitcher, and he had some of his best seasons there.

In 1992, the Angels inducted him into their Hall of Fame and retired his number 30.  Ryan entered the Angels Hall of Fame in 1992 and the Baseball Hall of Fame in 1999.

Mike Trout is the most underappreciated baseball player ever.

That is a bold statement, yes, and anyone who follows baseball has mad respect for Trout and that he is the player of the 2010s.  Saying that, even though he is an unassuming person who does not seek media attention, his skills should be far more celebrated than it has been.  As it stands, we can give him as much love as we can and state that as we are writing this, Trout, who is still an Angel, will be the greatest Angel all-time 100 years from now.

Trout debuted in 2011, playing in 40 Games, and in 2012 he was the starting Centerfielder for the Angels, going to the All-Star Game and winning the American League Rookie of the Year. The Silver Slugger and was the runner-up for the MVP.  This season set the pattern for what Trout would do for the rest of the decade.

After his ROY year, Trout was consistently spectacular in every facet of the game throughout the 2010s.  Playing at Centerfield, Trout won the American League MVP three times (2013, 2016, and 2019) and was the runner-up four times.  From 2012 to 2020, Trout never finished outside in the top-five in MVP voting, and he is also an nine-time Silver Slugger.

Through his career, you can't find a weak part in Trout's game.  His fielding is excellent, and he is a former Wilson Defensive Player of the Year.  He brings power.  Trout already has over 300 Home Runs, and he is a three-time leader in RBIs.  His lifetime Slash Line is .301/.412/.582, and if he keeps his Batting Average over .300, he could join the rare 3/4/5 career club.  He can steal, with five 20 SB seasons under his belt.  Trout does all the big things right and all the little things.  There is no such thing as the perfect player, but isn't Trout close?

As of this writing, Trout is still an Angel, and is only 32.  Not only is Mike Trout already the best baseball player in franchise history, but he could also conceivable become the greatest ever from a sabermetric point of view.  The only thing that stop that is his health.