Roberto Martinez took over the managerial reigns for Swansea in the middle of the 2006-2007 season and kept us out of relegation trouble in League One. Kenny Jackett, the former manager, played a completely different style of football than the current Swansea side. He was defensive minded and, quite frankly, we played ugly football.
In Roberto's first full season, he transformed the way the Swans played. They were still a good defensive side, but he started the transformation into more of a fluid, passing style. Granted, it didn't have as much passing as Brendon Rogers' current Swansea side, but Roberto got the team going in the right direction towards total football. Martinez signed Ashley Williams and Angel Rangel that season amongst others. Both players were regular starters for the Swans this past season. To sign Premier League quality players on a League One side is pretty incredible to me. I know that some will dispute this and say that they aren't that good, but I rate both players very well. Yes, they have had some time to mature, but it takes a keen eye for talent to pull those guys in. Swansea would go on to finish as the League One champions that year and gain automate promotion into the Championship.
In the 2008-2009 season, I have to admit that I thought Swansea would struggle and be in a relegation dogfight. Financially, Swansea were one of the poorest teams in the division and I thought this would handcuff them. However, Martinez is a very good man manager and can get a lot out of his players. The Swans would go on to finish in 8th place, just 6 points out of a playoff spot. Martinez would leave for Wigan after that season. He's kept Wigan in the Premier League for all 3 seasons he's been there even though they usually have bottom 3 type talent.
Martinez is a fantastic manager, but I do have one big worry about him. He's only been at two small clubs with very limited resources. How will he make the adjustment to a club where he can buy a single player for ₤20 million where before his entire transfer budget was much less than that? Some managers can make the leap and some can't. Some are stuck in the bargain hunter mode and can never leave that mentality. If Martinez can spend big on the right players, not just because he has the funds to spend big, he could be very successful at a big club.